# 71 (number)

 ← 70 71 72 →
Cardinal seventy-one
Ordinal 71st
(seventy-first)
Factorization prime
Prime 20th
Divisors 1, 71
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.

 Look up seventy-one in Wiktionary, the free dictionary.

## 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 science

In astronomy,

Messier object M71, a magnitude 8.5 globular cluster in the constellation Sagitta
The New General Catalogue object NGC 71, a magnitude 13.2 peculiar spiral galaxy in the constellation Andromeda
The Saros number of the solar eclipse series which began on -702 October 8 and ended on 777 March 14. The duration of Saros series 71 was 1478.4 years, and it contained 83 solar eclipses.
The Saros number of the lunar eclipse series which began on -472 June 4 and ended on 808 July 11. The duration of Saros series 71 was 1280.1 years, and it contained 72 lunar eclipses.

## 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.
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