Monday, February 23, 2009

251

251 is a prime number. It is also a Sophie Germain prime because 2 x 251 + 1 = 503 is also prime.

251 is the smallest number that is the sum of three different cubes in two ways: 251 = 13 + 53 + 53 = 23 + 33 + 63.

251 can be expressed using the first three primes: 251 = 23 + 33.

251 is a divisor of 205 - 1.


Telephone area code
251 covers southwestern Alabama.

Source:
Prime Curios!
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