# 1000 (number)

| ||||
---|---|---|---|---|

Cardinal | one thousand | |||

Ordinal | 1000th (one thousandth) | |||

Factorization | 2^{3}× 5^{3} | |||

Divisors | 1, 2, 4, 5, 8, 10, 20, 25, 40, 50, 100, 125, 200, 250, 500, 1000 | |||

Greek numeral | ,Α´ | |||

Roman numeral | M | |||

Greek prefix | chilia | |||

Latin prefix | milli | |||

Binary | 1111101000_{2} | |||

Ternary | 1101001_{3} | |||

Quaternary | 33220_{4} | |||

Quinary | 13000_{5} | |||

Senary | 4344_{6} | |||

Octal | 1750_{8} | |||

Duodecimal | 6B4_{12} | |||

Hexadecimal | 3E8_{16} | |||

Vigesimal | 2A0_{20} | |||

Base 36 | RS_{36} | |||

Urdu | ہزار | |||

Tamil | ௲ |

Look up in Wiktionary, the free dictionary.thousand |

**1000** or **one thousand** is the natural number following 999 and preceding 1001. In most English-speaking countries, it is often written with a comma separating the thousands unit: **1,000**. In analogy to the term *century* for '100 years' the time lapse of 1,000 years is sometimes termed, after the Greek root, **chiliad**. A chiliad of other objects means 1,000 of them.

It may also be described as the **short thousand** in historical discussion of medieval contexts where it might be confused with the Germanic concept of the "long thousand" (1200).

## Contents

## In mathematics[edit]

- The decimal representation for one thousand is
**1000**—a one followed by three zeros, in the general notation ;**1 × 10**—in engineering notation, which for this number coincides with :^{3}**1 × 10**exactly—in scientific normalized exponential notation ;^{3}**1 E+3**exactly—in scientific E notation.

- The SI prefix for a thousand is
**kilo-**, with the official symbol**k**—for instance, prefixed to "metre" or its symbol "m", kilometre or km signifies a thousand metres. As such, people occasionally represent the number in a non-standard notation by replacing the last three zeros of the general numeral with "K": for instance, 30K for 30,000. - By the SI writing style, a space can be used as a thousands separator, i.e., to separate the digits of a number at every power of 1 000.
- The sum of Euler's totient function over the first 57 integers is 1000.
- Prime Curios! mentions that 1000 is the smallest number that generates three primes in the fastest way possible by concatenation of decremented numbers (1000999, 1000999998997, and 1000999998997996995994993 are prime). The criterion excludes counting the number itself.
- 1000 is a Harshad number in base 10.

## In time[edit]

- A millennium is 1,000 years. The year 1000 was the last year of the 1st millennium.

## In popular culture[edit]

- A
*grand*is a slang term for one thousand units of a given currency, usually dollars or pounds. Several*grand*can be shortened to*G*s. - The symbol
*K*is sometimes used for a thousand; for example, in referring to units of salary or in reference to the Y2K computer bug. - Especially in the United States, the gambling community often refers to denominations of $1000 as
*dimes*. - The idiom "a picture is worth a thousand words".
- According to an ancient Japanese legend, anyone who folds a thousand origami cranes will be granted a wish by a crane.
- The thousandth of something is often celebrated, as with other round numbers. A good example is a millennium.

## Miscellaneous[edit]

- Thousand Oaks, California
- Metal Mining SIC Code
- Thousand Island dressing
*1000 Families: das Familienalbum des Planeten Erde*, a picture book by Uwe Ommer- Expedition of the Thousand

## Music[edit]

- Thousand Foot Krutch, an alternative rock band
- I Feel It/Thousand, a 1993 techno single by Moby
*A Thousand Suns*, a 2010 album by Linkin Park- A Thousand Years, a 2011 song by Christina Perri
- A Thousand Miles, a 2002 song by Vanessa Carlton
- A Thousand Answers, a 2012 song by The Hives
- 1000hp, a 2014 song by Godsmack

## Selected numbers in the range 1001–1999[edit]

### 1001 to 1099[edit]

**1001**– sphenic number (7 × 11 × 13), pentagonal number, pentatope number**1002**– sphenic number, Mertens function zero, abundant number**1004**– heptanacci number^{[1]}**1005**– Mertens function zero**1008**– divisible by the number of primes below it**1009**– smallest four-digit prime, palindromic in bases 11, 15, 19, 24 and 28: (838_{11}, 474_{15}, 2F2_{19}, 1I1_{24}, 181_{28})**1010**– Mertens function zero**1011**– The largest number that 2^{n}contains 101 and doesn't contain 11011, and it is a Harshad number in bases 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75 (and 202 other bases).**1013**– Sophie Germain prime,^{[2]}centered square number,^{[3]}Mertens function zero**1014**– Mertens function zero**1015**– square pyramidal number^{[4]}**1016**– member of the Mian–Chowla sequence,^{[5]}stella octangula number**1018**– Mertens function zero**1019**– Sophie Germain prime,^{[2]}safe prime^{[6]}**1020**– polydivisible number**1022**– Friedman number**1023**– the highest number one can count to on one's fingers using binary; also the magic number used in Global Positioning System signals**1024**– 2^{10}, the number of bytes in a kilobyte (in 1999, the IEC coined kibibyte to use for 1024 with kilobyte being 1000, but this convention has not been widely adopted)**1027**– sum of the squares of the first eight primes; can be written from base 2 to base 18 using only the digits 0 to 9.**1028**– sum of totient function for first 58 integers; can be written from base 2 to base 18 using only the digits 0 to 9.**1029**– can be written from base 2 to base 18 using only the digits 0 to 9.**1031**– Sophie Germain prime,^{[2]}super-prime**1033**– locale ID of English (United States) in (some version of) Windows.^{[7]}**1035**– triangular number,^{[8]}hexagonal number^{[9]}**1049**– Sophie Germain prime,^{[2]}highly cototient number^{[10]}**1051**– centered pentagonal number,^{[11]}centered decagonal number**1056**– pronic number^{[12]}**1060**– sum of the first 25 primes**1063**– super-prime, sum of seven consecutive primes (137 + 139 + 149 + 151 + 157 + 163 + 167)**1071**– heptagonal number^{[13]}**1072**– centered heptagonal number^{[14]}**1079**– every positive integer is the sum of at most 1079 tenth powers.**1080**– pentagonal number^{[15]}**1081**– triangular number,^{[8]}member of Padovan sequence^{[16]}**1086**– Smith number,^{[17]}sum of totient function for first 59 integers**1087**– super-prime, cousin prime, lucky prime,^{[18]}Kynea number^{[19]}**1089**– 33^{2}, nonagonal number, centered octagonal number, first natural integer which digits in its decimal expression get reversed when multiplied by 9.^{[20]}**1091**– cousin prime and twin prime**1092**– divisible by the number of primes below it**1093**– the smallest Wieferich prime (the only other known Wieferich prime is 3511^{[21]}), twin prime and star number^{[22]}

### 1100 to 1199[edit]

**1102**– sum of totient function for first 60 integers**1103**– Sophie Germain prime,^{[2]}balanced prime^{[23]}**1104**– Keith number^{[24]}**1105**– Carmichael number,^{[25]}magic constant of*n*×*n*normal magic square and*n*-queens problem for*n*= 13, decagonal number,^{[26]}centered square number,^{[3]}1105 = 33^{2}+ 4^{2}= 32^{2}+ 9^{2}= 31^{2}+ 12^{2}= 23^{2}+ 24^{2}**1116**– divisible by the number of primes below it**1122**– pronic number,^{[12]}divisible by the number of primes below it**1123**– balanced prime^{[23]}**1124**– Leyland number^{[27]}**1128**– triangular number,^{[8]}hexagonal number,^{[9]}divisible by the number of primes below it**1134**- divisible by the number of primes below it**1138**– recurring number in the works of George Lucas and his companies, beginning with his first feature film –*THX 1138*; particularly, a special code for Easter eggs on*Star Wars*DVDs.**1140**– tetrahedral number^{[28]}**1151**– first prime following a prime gap of 22.^{[29]}**1152**– highly totient number^{[30]}**1153**– super-prime, Proth prime^{[31]}**1156**– 34^{2}, octahedral number,^{[32]}centered pentagonal number,^{[11]}centered hendecagonal number.^{[33]}**1159**– member of the Mian–Chowla sequence^{[5]}**1161**– sum of the first 26 primes**1162**– pentagonal number,^{[15]}sum of totient function for first 61 integers**1169**– highly cototient number^{[10]}**1170**– highest possible score in a National Academic Quiz Tournaments (NAQT) match**1171**– super-prime**1176**– triangular number^{[8]}**1177**– heptagonal number^{[13]}**1184**– amicable number with 1210^{[34]}**1187**– safe prime,^{[6]}Stern prime,^{[35]}balanced prime^{[23]}**1190**– pronic number^{[12]}**1192**– sum of totient function for first 62 integers**1198**– centered heptagonal number^{[14]}

### 1200 to 1299[edit]

**1200**– the**long thousand**, ten "long hundreds" of 120 each, the traditional reckoning of large numbers in Germanic languages, the number of households the Nielsen ratings sample^{[36]}**1201**– centered square number,^{[3]}super-prime, centered decagonal number**1210**– amicable number with 1184^{[37]}**1213**– emirp**1216**– nonagonal number^{[38]}**1217**– super-prime, Proth prime^{[31]}**1219**– Mertens function zero**1220**– Mertens function zero**1223**– Sophie Germain prime,^{[2]}balanced prime, 200th prime number^{[23]}**1225**– 35^{2}, triangular number, square triangular number,^{[39]}hexagonal number,^{[9]}centered octagonal number^{[40]}**1228**– sum of totient function for first 63 integers**1229**– Sophie Germain prime,^{[2]}number of primes between 0 and 10000**1233**– 12^{2}+ 33^{2}**1237**– prime of the form 2p-1**1240**– square pyramidal number^{[4]}**1241**– centered cube number^{[41]}**1242**– decagonal number^{[26]}**1247**– pentagonal number^{[15]}**1249**– emirp, trimorphic number^{[42]}**1255**– Mertens function zero**1256**– Mertens function zero**1258**– Mertens function zero**1259**– highly cototient number^{[10]}**1260**– highly composite number,^{[43]}pronic number,^{[12]}the smallest vampire number,^{[44]}sum of totient function for first 64 integers, this number appears twice in the Book of Revelation**1261**– star number,^{[22]}Mertens function zero**1264**– sum of the first 27 primes**1266**– centered pentagonal number,^{[11]}Mertens function zero**1270**– Mertens function zero**1275**– triangular number,^{[8]}sum of the first 50 natural numbers**1279**– Mertens function zero**1280**– Mertens function zero**1282**– Mertens function zero**1283**– safe prime^{[6]}**1285**– Mertens function zero**1288**– heptagonal number^{[13]}**1289**– Sophie Germain prime,^{[2]}Mertens function zero**1291**– Mertens function zero**1292**– Mertens function zero**1296**– 6^{4}, 36^{2}, sum of the cubes of the first eight positive integers, the number of rectangles on a normal 8 × 8 chessboard, also the maximum font size allowed in Adobe InDesign**1297**– super-prime, Mertens function zero**1299**– Mertens function zero

### 1300 to 1399[edit]

**1300**– Sum of the first 4 fifth powers, mertens function zero, largest possible win margin in an NAQT match**1301**– centered square number^{[3]}**1302**– Mertens function zero**1306**– Mertens function zero. In base 10, raising the digits of 1306 to powers of successive integers equals itself: 1306 = 1^{1}+ 3^{2}+ 0^{3}+ 6^{4}. 135, 175, 518, and 598 also have this property.**1307**– safe prime^{[6]}**1308**– sum of totient function for first 65 integers**1309**– the first sphenic number followed by two consecutive such number**1312**– member of the Mian–Chowla sequence;^{[5]}code for "ACAB" itself an acronym for "all cops are bastards"^{[45]}**1318**– Mertens function zero**1319**– safe prime^{[6]}**1325**– Markov number^{[46]}**1326**– triangular number,^{[8]}hexagonal number,^{[9]}Mertens function zero**1327**– first prime followed by 33 consecutive composite numbers**1328**– sum of totient function for first 66 integers**1329**– Mertens function zero**1330**– tetrahedral number,^{[27]}forms a Ruth–Aaron pair with 1331 under second definition**1331**– 11^{3}, centered heptagonal number,^{[14]}forms a Ruth–Aaron pair with 1330 under second definition. This is the only cube of the form*x*^{2}+*x*− 1, for*x*= 36.**1332**– pronic number^{[12]}**1335**– pentagonal number,^{[15]}Mertens function zero**1336**– Mertens function zero**1337**– Used in the novel form of spelling called leet. Approximate melting point of gold in kelvins.**1338**– Mertens function zero**1342**– Mertens function zero**1350**– nonagonal number^{[38]}**1361**– first prime following a prime gap of 34,^{[29]}centered decagonal number**1365**– pentatope number^{[47]}**1367**– safe prime,^{[6]}balanced prime, sum of three, nine, and eleven consecutive primes (449 + 457 + 461, 131 + 137 + 139 + 149 + 151 + 157 + 163 + 167 + 173, and 101 + 103 + 107 + 109 + 113 + 127 + 131 + 137 + 139 + 149 + 151),^{[23]}**1369**– 37^{2}, centered octagonal number^{[40]}**1371**– sum of the first 28 primes**1378**– triangular number^{[8]}**1379**– magic constant of*n*×*n*normal magic square and*n*-queens problem for*n*= 14.**1381**– centered pentagonal number^{[11]}**1387**– 5th Fermat pseudoprime of base 2,^{[48]}22nd centered hexagonal number and the 19th decagonal number,^{[26]}second Super-Poulet number.^{[49]}**1394**– sum of totient function for first 67 integers**1395**– vampire number,^{[44]}member of the Mian–Chowla sequence^{[5]}

### 1400 to 1499[edit]

**1404**– heptagonal number^{[13]}**1405**– 26^{2}+ 27^{2}, 7^{2}+ 8^{2}+ … + 16^{2}, centered square number^{[3]}**1406**– pronic number,^{[12]}semi-meandric number^{[50]}**1409**– super-prime, Sophie Germain prime,^{[2]}smallest number whose eighth power is the sum of 8 eighth powers, Proth prime^{[31]}**1419**– Zeisel number^{[51]}**1425**– self-descriptive number in base 5**1426**– sum of totient function for first 68 integers, pentagonal number^{[15]}**1430**– Catalan number^{[52]}**1431**– triangular number,^{[8]}hexagonal number^{[9]}**1432**– member of Padovan sequence^{[16]}**1433**– super-prime, Typical port used for remote connections to Microsoft SQL Server databases**1435**– vampire number;^{[44]}the standard railway gauge in millimetres, equivalent to 4' 8½"**1439**– Sophie Germain prime,^{[2]}safe prime^{[6]}**1440**– a highly totient number^{[30]}and a 481-gonal number. Also, the number of minutes in one day, the blocksize of a standard 3 1/2 floppy disk, and the horizontal resolution of WXGA(II) computer displays**1441**– star number^{[22]}**1444**– 38^{2}, smallest pandigital number in Roman numerals**1447**– super-prime, happy number**1451**– Sophie Germain prime^{[2]}**1458**– maximum determinant of an 11 by 11 matrix of zeroes**1459**– Sexy prime with 1453, sum of nine consecutive primes (139 + 149 + 151 + 157 + 163 + 167 + 173 + 179 + 181), pierpont prime**1469**– octahedral number,^{[32]}highly cototient number^{[10]}**1470**– pentagonal pyramidal number,^{[53]}sum of totient function for first 69 integers**1471**– super-prime, centered heptagonal number^{[14]}**1480**– sum of the first 29 primes**1481**– Sophie Germain prime^{[2]}**1482**– pronic number^{[12]}**1485**– triangular number**1487**– safe prime^{[6]}**1490**– tetranacci number^{[54]}**1491**– nonagonal number,^{[38]}Mertens function zero**1492**– Mertens function zero**1493**– Stern prime^{[35]}**1494**– sum of totient function for first 70 integers**1496**– square pyramidal number^{[4]}**1499**– Sophie Germain prime,^{[2]}super-prime

### 1500 to 1599[edit]

**1501**– centered pentagonal number^{[11]}**1510**– deficient number, odious number**1511**– Sophie Germain prime,^{[2]}balanced prime^{[23]}**1513**– centered square number^{[3]}**1518**– Mertens function zero**1519**– Mertens function zero**1520**– pentagonal number,^{[15]}Mertens function zero, forms a Ruth–Aaron pair with 1521 under second definition**1521**– 39^{2}, Mertens function zero, centered octagonal number,^{[40]}forms a Ruth–Aaron pair with 1520 under second definition**1523**– super-prime, Mertens function zero, safe prime,^{[6]}member of the Mian–Chowla sequence^{[5]}**1524**– Mertens function zero**1525**– heptagonal number,^{[13]}Mertens function zero**1527**– Mertens function zero**1528**– Mertens function zero**1530**– vampire number^{[44]}**1531**– centered decagonal number, Mertens function zero**1532**– Mertens function zero**1535**– Thabit number**1536**- a common size of microplate**1537**– Keith number,^{[24]}Mertens function zero**1540**– triangular number, hexagonal number,^{[9]}decagonal number,^{[26]}tetrahedral number^{[27]}**1543**– Mertens function zero**1544**– Mertens function zero**1546**– Mertens function zero**1556**– sum of the squares of the first nine primes**1559**– Sophie Germain prime^{[2]}**1560**– pronic number^{[12]}**1564**– sum of totient function for first 71 integers**1572**– member of the Mian–Chowla sequence^{[5]}**1575**– odd abundant number^{[55]}**1583**– Sophie Germain prime**1588**– sum of totient function for first 72 integers**1593**– sum of the first 30 primes**1596**– triangular number**1597**– Fibonacci number,^{[56]}Markov number,^{[46]}super-prime, emirp

### 1600 to 1699[edit]

**1600**– 40^{2}, repdigit in base 7 (4444_{7}), street number on Pennsylvania Avenue of the White House, length in meters of a common High School Track Event, perfect score on SAT (except from 2005-2015)**1601**– Sophie Germain prime, Proth prime,^{[31]}the novel*1601 (Mark Twain)***1617**– pentagonal number^{[15]}**1618**– centered heptagonal number^{[14]}**1619**– safe prime^{[6]}**1621**– super-prime**1625**– centered square number^{[3]}**1626**– centered pentagonal number^{[11]}**1633**– star number^{[22]}**1638**– harmonic divisor number^{[57]}**1639**– nonagonal number^{[38]}**1640**– pronic number^{[12]}**1649**– highly cototient number,^{[10]}Leyland number^{[27]}**1651**– heptagonal number^{[13]}**1653**– triangular number, hexagonal number^{[9]}**1657**– cuban prime,^{[58]}prime of the form 2p-1**1660**– sum of totient function for first 73 integers**1666**– largest efficient pandigital number in Roman numerals (each symbol occurs exactly once)**1669**– super-prime**1679**– highly cototient number,^{[10]}semiprime (23 × 73, see also Arecibo message)**1680**– highly composite number^{[43]}**1681**– 41^{2}, smallest number yielded by the formula*n*^{2}+*n*+ 41 that is not a prime; centered octagonal number^{[40]}**1682**– member of a Ruth–Aaron pair (first definition)**1683**– member of a Ruth–Aaron pair (first definition)**1695**– magic constant of*n*×*n*normal magic square and*n*-queens problem for*n*= 15.**1696**– sum of totient function for first 74 integers

### 1700 to 1799[edit]

**1701**– decagonal number, hull number of the U.S.S. Enterprise on*Star Trek***1702**– palindromic in 3 consecutive bases: 898_{14}, 787_{15}, 6A6_{16}**1705**– tribonacci number^{[59]}**1709**– first of a sequence of eight primes formed by adding 57 in the middle. 1709, 175709, 17575709, 1757575709, 175757575709, 17575757575709, 1757575757575709 and 175757575757575709 are all prime, but 17575757575757575709 = 232433 × 75616446785773**1711**– triangular number, centered decagonal number**1717**– pentagonal number^{[15]}**1720**– sum of the first 31 primes**1722**– Giuga number,^{[60]}pronic number^{[12]}**1723**– super-prime**1728**– the quantity expressed as 1000 in duodecimal, that is, the cube of twelve (called a great gross), and so, the number of cubic inches in a cubic foot, palindromic in base 11 (1331_{11}) and 23 (363_{23})**1729**– taxicab number, Carmichael number, Zeisel number, centered cube number, Hardy–Ramanujan number. In the decimal expansion of e the first time all 10 digits appear in sequence starts at the 1729th decimal place. In 1979 the rock musical*Hair*closed on Broadway in New York City after 1729 performances. Palindromic in bases 12, 32, 36.**1733**– Sophie Germain prime, palindromic in bases 3, 18, 19.**1736**– sum of totient function for first 75 integers**1741**– super-prime, centered square number^{[3]}**1747**– balanced prime^{[23]}**1753**– balanced prime^{[23]}**1756**– centered pentagonal number^{[11]}**1760**– the number of yards in a mile**1764**– 42^{2}**1770**– triangular number, hexagonal number,^{[9]}Town of Seventeen Seventy in Australia**1771**– tetrahedral number^{[27]}**1772**– centered heptagonal number,^{[14]}sum of totient function for first 76 integers**1782**– heptagonal number^{[13]}**1785**– square pyramidal number^{[4]}**1787**– super-prime, sum of eleven consecutive primes (137 + 139 + 149 + 151 + 157 + 163 + 167 + 173 + 179 + 181 + 191)**1791**– largest natural number that cannot be expressed as a sum of at most four hexagonal numbers.**1794**– nonagonal number^{[38]}

### 1800 to 1899[edit]

**1800**– pentagonal pyramidal number,^{[53]}Achilles number, also, in da Ponte's*Don Giovanni*, the number of women Don Giovanni had slept with so far when confronted by Donna Elvira, according to Leporello's tally**1801**– cuban prime, sum of five and nine consecutive primes (349 + 353 + 359 + 367 + 373 and 179 + 181 + 191 + 193 + 197 + 199 + 211 + 223 + 227)^{[58]}**1806**– pronic number,^{[12]}product of first four terms of Sylvester's sequence, primary pseudoperfect number,^{[61]}only number for which*n*equals the denominator of the*n*th Bernoulli number^{[62]}**1807**– fifth term of Sylvester’s sequence^{[63]}**1811**– Sophie Germain prime**1820**– pentagonal number,^{[15]}pentatope number^{[47]}**1821**– member of the Mian–Chowla sequence^{[5]}**1823**– super-prime, safe prime^{[6]}**1827**– vampire number^{[44]}**1828**– meandric number, open meandric number**1830**– triangular number**1832**– sum of totient function for first 77 integers**1834**– octahedral number,^{[32]}sum of the cubes of the first five primes**1836**– factor by which a proton is more massive than an electron**1837**– star number^{[22]}**1841**– Mertens function zero**1843**– Mertens function zero**1844**– Mertens function zero**1845**– Mertens function zero**1847**– super-prime**1849**– 43^{2}, palindromic in base 6 (= 12321_{6}), centered octagonal number^{[40]}**1851**– sum of the first 32 primes**1853**– Mertens function zero**1854**– Mertens function zero**1856**– sum of totient function for first 78 integers**1857**– Mertens function zero**1861**– centered square number,^{[3]}Mertens function zero**1862**– Mertens function zero, forms a Ruth–Aaron pair with 1863 under second definition**1863**– Mertens function zero, forms a Ruth–Aaron pair with 1862 under second definition**1864**– Mertens function zero**1866**– Mertens function zero**1870**– decagonal number^{[26]}**1885**– Zeisel number^{[51]}**1889**– Sophie Germain prime, highly cototient number^{[10]}**1891**– triangular number, hexagonal number,^{[9]}centered pentagonal number^{[11]}**1892**– pronic number^{[12]}**1896**– member of the Mian–Chowla sequence^{[5]}**1897**– member of Padovan sequence^{[16]}

### 1900 to 1999[edit]

**1900**–*1900*(film) or*Novecento*, 1976 movie**1901**– Sophie Germain prime, centered decagonal number**1907**– safe prime,^{[6]}balanced prime^{[23]}**1909**– hyperperfect number^{[64]}**1913**– super-prime**1918**– heptagonal number^{[13]}**1926**– pentagonal number^{[15]}**1929**– Mertens function zero**1931**– Sophie Germain prime**1933**– centered heptagonal number,^{[14]}prime number**1934**– sum of totient function for first 79 integers**1936**– 44^{2}, 18-gonal number,^{[65]}324-gonal number.**1938**– Mertens function zero**1951**– cuban prime^{[58]}**1953**– triangular number**1956**– nonagonal number^{[38]}**1966**– sum of totient function for first 80 integers**1969**– Only value less than four million for which a "mod-ification" of the standard Ackermann Function does not stabilize^{[66]}-
**1973**– Sophie Germain prime **1980**– pronic number^{[12]}**1984**– 11111000000 in binary, see also: 1984 (disambiguation)**1985**– centered square number^{[3]}**1987**– 300th prime number**1988**– sum of the first 33 primes

## References[edit]

Wikimedia Commons has media related to .1000 (number) |

**^**"Sloane's A122189 : Heptanacci numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2017-07-13.- ^
^{a}^{b}^{c}^{d}^{e}^{f}^{g}^{h}^{i}^{j}^{k}^{l}^{m}^{n}^{o}"Sloane's A005384 : Sophie Germain primes".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. - ^
^{a}^{b}^{c}^{d}^{e}^{f}^{g}^{h}^{i}^{j}"Sloane's A001844 : Centered square numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. - ^
^{a}^{b}^{c}^{d}"Sloane's A000330 : Square pyramidal numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. - ^
^{a}^{b}^{c}^{d}^{e}^{f}^{g}^{h}"Sloane's A005282 : Mian-Chowla sequence".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. - ^
^{a}^{b}^{c}^{d}^{e}^{f}^{g}^{h}^{i}^{j}^{k}^{l}"Sloane's A005385 : Safe primes".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. **^**[1].- ^
^{a}^{b}^{c}^{d}^{e}^{f}^{g}^{h}"Sloane's A000217 : Triangular numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. - ^
^{a}^{b}^{c}^{d}^{e}^{f}^{g}^{h}^{i}"Sloane's A000384 : Hexagonal numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. - ^
^{a}^{b}^{c}^{d}^{e}^{f}^{g}"Sloane's A100827 : Highly cototient numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. - ^
^{a}^{b}^{c}^{d}^{e}^{f}^{g}^{h}"Sloane's A005891 : Centered pentagonal numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. - ^
^{a}^{b}^{c}^{d}^{e}^{f}^{g}^{h}^{i}^{j}^{k}^{l}^{m}"Sloane's A002378 : Oblong (or promic, pronic, or heteromecic) numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. - ^
^{a}^{b}^{c}^{d}^{e}^{f}^{g}^{h}"Sloane's A000566 : Heptagonal numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. - ^
^{a}^{b}^{c}^{d}^{e}^{f}^{g}"Sloane's A069099 : Centered heptagonal numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. - ^
^{a}^{b}^{c}^{d}^{e}^{f}^{g}^{h}^{i}^{j}"Sloane's A000326 : Pentagonal numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. - ^
^{a}^{b}^{c}"Sloane's A000931 : Padovan sequence".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. **^**"Sloane's A006753 : Smith numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12.**^**"Sloane's A031157 : Numbers that are both lucky and prime".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12.**^**"Sloane's A093069 : a(n) = (2^n + 1)^2 - 2".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12.**^**"Sloane's A001232 : Numbers n such that 9*n = (n written backwards)".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-14.**^**Wells, D.*The Penguin Dictionary of Curious and Interesting Numbers*London: Penguin Group. (1987): 163- ^
^{a}^{b}^{c}^{d}^{e}"Sloane's A003154 : Centered 12-gonal numbers. Also star numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. - ^
^{a}^{b}^{c}^{d}^{e}^{f}^{g}^{h}^{i}"Sloane's A006562 : Balanced primes".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. - ^
^{a}^{b}"Sloane's A007629 : Repfigit (REPetitive FIbonacci-like diGIT) numbers (or Keith numbers)".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. **^**"Sloane's A002997 : Carmichael numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12.- ^
^{a}^{b}^{c}^{d}^{e}"Sloane's A001107 : 10-gonal (or decagonal) numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. - ^
^{a}^{b}^{c}^{d}^{e}"Sloane's A076980 : Leyland numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. **^**"Sloane's A000292 : Tetrahedral numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12.- ^
^{a}^{b}"Sloane's A000101 : Increasing gaps between primes (upper end)".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-07-10. - ^
^{a}^{b}"Sloane's A097942 : Highly totient numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. - ^
^{a}^{b}^{c}^{d}"Sloane's A080076 : Proth primes".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. - ^
^{a}^{b}^{c}"Sloane's A005900 : Octahedral numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. **^**"Sloane's A069125 : a(n) = (11*n^2 - 11*n + 2)/2".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12.**^**Higgins, Peter (2008).*Number Story: From Counting to Cryptography*. New York: Copernicus. p. 61. ISBN 978-1-84800-000-1.- ^
^{a}^{b}"Sloane's A042978 : Stern primes".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. **^**Meehan, Eileen R.,*Why TV is not our fault: television programming, viewers, and who's really in control*Lanham, MD: Rowman & Littlefield, 2005**^**Higgins, ibid.- ^
^{a}^{b}^{c}^{d}^{e}^{f}"Sloane's A001106 : 9-gonal (or enneagonal or nonagonal) numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. **^**"Sloane's A001110 : Square triangular numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12.- ^
^{a}^{b}^{c}^{d}^{e}"Sloane's A016754 : Odd squares: a(n) = (2n+1)^2. Also centered octagonal numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. **^**"Sloane's A005898 : Centered cube numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12.**^**"Sloane's A033819 : Trimorphic numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12.- ^
^{a}^{b}"Sloane's A002182 : Highly composite numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. - ^
^{a}^{b}^{c}^{d}^{e}"Sloane's A014575 : Vampire numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. **^**"Constitutional Court allows 'FCK CPS' sticker". 28 April 2015."...state court in Karlsruhe ruled that a banner ... that read 'ACAB' - an abbreviation of 'all cops are bastards' ... a punishable insult. ... A court in Frankfurt ... the numbers '1312' constituted an insult ... the numerals stand for the letters ACAB's position in the alphabet.

- ^
^{a}^{b}"Sloane's A002559 : Markoff (or Markov) numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. - ^
^{a}^{b}"Sloane's A000332 : Binomial coefficient binomial(n,4) = n*(n-1)*(n-2)*(n-3)/24".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. **^**"Sloane's A001567 : Fermat pseudoprimes to base 2".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12.**^**"Sloane's A050217 : Super-Poulet numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12.**^**"Sloane's A000682 : Semimeanders".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12.- ^
^{a}^{b}"Sloane's A051015 : Zeisel numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. **^**"Sloane's A000108 : Catalan numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12.- ^
^{a}^{b}"Sloane's A002411 : Pentagonal pyramidal numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. **^**"Sloane's A000078 : Tetranacci numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12.**^**"Sloane's A005231 : Odd abundant numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12.**^**"Sloane's A000045 : Fibonacci numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12.**^**"Sloane's A001599 : Harmonic or Ore numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12.- ^
^{a}^{b}^{c}"Sloane's A002407 : Cuban primes".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12. **^**"Sloane's A000073 : Tribonacci numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12.**^**"Sloane's A007850 : Giuga numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12.**^**"Sloane's A054377 : Primary pseudoperfect numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12.**^**Kellner, Bernard C.; ‘The equation denom(B_{n}) =*n*has only one solution’**^**"Sloane's A000058 : Sylvester's sequence".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12.**^**"Sloane's A034897 : Hyperperfect numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12.**^**"Sloane's A051870 : 18-gonal numbers".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2016-06-12.**^**Jon Froemke & Jerrold W. Grossman (Feb 1993). "A Mod-n Ackermann Function, or What's So Special About 1969?".*The American Mathematical Monthly*. Mathematical Association of America.**100**(2): 180–183. JSTOR 2323780.