251 (number)

251 (number)

251 is the natural number between 250 and 252. It is also a prime number.

In mathematics

251 is a regular prime, an Eisenstein prime, a Chen prime, a Gaussian prime, a Sophie Germain prime, and a sexy prime.

251 is also sum of three consecutive primes (79 + 83 + 89) and sum of seven consecutive primes (23 + 29 + 31 + 37 + 41 + 43 + 47).

251 is also the smallest number that can be written as the sum of three cubes in two ways: 251 = 13 + 53 + 53 = 23 + 33 + 63.

In other fields

*Vermont 251 Club is a club in which members try to visit each of the 251 towns and cities of Vermont.
*The number of Pokémon available in Pokémon Gold and Silver is 251.
*"251" is a title of a play based on Annabel Chong story, who became famous for engaging in 251 sex acts over ten hours period in January 1995, setting a world record as the world's biggest gang bang.
*251 is also the name of a very difficult Computer Science class at Carnegie Mellon University (the full name is 15-251). The homepage of this site is http://www.cs.cmu.edu/~15251/.


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