# 71 (number)

 ← 70 71 72 →
Cardinal seventy-one
Ordinal 71st
(seventy-first)
Factorization prime
Prime 20th
Divisors 1, 71
Greek numeral ΟΑ´
Roman numeral LXXI
Binary 10001112
Ternary 21223
Quaternary 10134
Quinary 2415
Senary 1556
Octal 1078
Duodecimal 5B12
Vigesimal 3B20
Base 36 1Z36

71 (seventy-one) is the natural number following 70 and preceding 72.

## In mathematics

71 is:

If we add up the primes less than 71 (2 through 67), we get 568, which is divisible by 71, 8 times.

## In other fields

Seventy-one is also:

## References

1. ^ "Sloane's A069099 : Centered heptagonal numbers". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
2. ^ "Sloane's A063980 : Pillai primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
3. ^ "Sloane's A002267 : The 15 supersingular primes". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
4. ^ "Sloane's A000945 : Euclid-Mullin sequence". The On-Line Encyclopedia of Integer Sequences. OEIS Foundation. Retrieved 2016-05-29.
5. ^ "Tables of imaginary quadratic fields with small class number". numbertheory.org.