55 (number)

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← 54 55 56 →
Cardinal fifty-five
Ordinal 55th
(fifty-fifth)
Factorization 5 × 11
Divisors 1, 5, 11, 55
Greek numeral ΝΕ´
Roman numeral LV
Binary 1101112
Ternary 20013
Quaternary 3134
Quinary 2105
Senary 1316
Octal 678
Duodecimal 4712
Hexadecimal 3716
Vigesimal 2F20
Base 36 1J36

55 (fifty-five) is the natural number following 54 and preceding 56.

Mathematics[edit]

55 is the 10th Fibonacci number[1] and a triangular number (the sum of the consecutive numbers 1 to 10).[2] It is the largest Fibonacci number to also be a triangular number.

It is a square pyramidal number (the sum of the squares of the integers 1 to 5)[3] as well as a heptagonal number,[4] and a centered nonagonal number.[5]

In base 10, it is a Kaprekar number.[6]

Science[edit]

Astronomy[edit]

Music[edit]

  • A song produced by Group X was called "Schfifty Five".
  • The name of a song by British Indie Rock Band Kasabian. The song was released as a B side to Club Foot and was recorded live when the band performed at London's Brixton Academy.
  • I Can't Drive 55, a song by Sammy Hagar
  • Ol' '55, a song by Tom Waits
  • Cristian Vogel released an album in 2005 with the title "Station 55"
  • Ol' 55 (band), an Australian rock band.
  • Primer 55 an American band
  • 55 Cadillac, an album by Andrew W.K.

Transportation[edit]

  • Most speed limits in the United States is 55 MPH on highways

Film[edit]

Years[edit]

Other uses[edit]

See also[edit]

References[edit]

  1. ^ "Sloane's A000045 : Fibonacci numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30. 
  2. ^ "Sloane's A000217 : Triangular numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30. 
  3. ^ "Sloane's A000330 : Square pyramidal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30. 
  4. ^ "Sloane's A000566 : Heptagonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30. 
  5. ^ "Sloane's A060544 : Centered 9-gonal (also known as nonagonal or enneagonal) numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30. 
  6. ^ "Sloane's A006886 : Kaprekar numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-30.