71 (number)
Sixty and eleven redirects here. This article is relating to number 71. For the year, to see 71.
71 ( sixty and eleven or sixty-and-eleven or seventy and a ) is the Entier naturalness which follows 70 and which precedes 72.
In mathematics
Sixty and eleven is the 20th Prime number, following it being 73 with which it forms a couple of Prime numbers twins. It is a Prime numbers cousins with 67. By permuting the figures of his decimal writing, one obtains 17 which is also first. The sum of all the prime numbers smaller than 71 (2 with 67) is 568 which is divisible eight times by 71.
71 is a heptagonal Nombre centered.
71 is largest of the prime numbers super-singular.
In other fields
Sixty and eleven is also:
-
the Atomic number of the Lutécium, a Metal of transition;
- the n° of the French Department, the Saône-et-Loire;
- relates to the historical years: -71, 71 or 1971.
Zh-yue: 71
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