251 (number)

Last updated
250 251 252
Cardinal two hundred fifty-one
Ordinal 251st
(two hundred fifty-first)
Factorization prime
Prime 54th
Greek numeral ΣΝΑ´
Roman numeral CCLI, ccli
Binary 111110112
Ternary 1000223
Senary 10556
Octal 3738
Duodecimal 18B12
Hexadecimal FB16

251 (two hundred [and] fifty-one) is the natural number between 250 and 252. It is also a prime number.

In mathematics

251 is:

Every 5 × 5 matrix has exactly 251 square submatrices. [7]

References

  1. Sloane, N. J. A. (ed.). "SequenceA005384(Sophie Germain primes p: 2p+1 is also prime)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  2. Sloane, N. J. A. (ed.). "SequenceA109611(Chen primes)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  3. Sloane, N. J. A. (ed.). "SequenceA006285(Odd numbers not of form p + 2^x (de Polignac numbers))". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  4. Kozek, Mark Robert (2007), Applications of Covering Systems of Integers and Goldbach's Conjecture for Monic Polynomials, PhD dissertation, University of South Carolina, p. 14, ISBN   9780549210207 .
  5. Sloane, N. J. A. (ed.). "SequenceA008917(Numbers that are the sum of 3 positive cubes in more than one way)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  6. De Koninck, Jean-Marie (2009), Those fascinating numbers, Providence, RI: American Mathematical Society, p. 64, ISBN   978-0-8218-4807-4, MR   2532459 .
  7. Sloane, N. J. A. (ed.). "SequenceA030662(Number of combinations of n things from 1 to n at a time, with repeats allowed)". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.