251 (number)
251 is the natural number between 250 and 252. It is also a prime number.
In mathematics
251 is:- a Sophie Germain prime.
- the sum of three consecutive primes and seven consecutive primes.
- a Chen prime.
- an Eisenstein prime with no imaginary part.
- a de Polignac number, meaning that it is odd and cannot be formed by adding a power of two to a prime number.
- the first of four consecutive primes in an arithmetic progression, the common difference being 6: 251, 257, 263, 269.
- the smallest number that can be formed in more than one way by summing three positive cubes: