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251 (number)

From Wikipedia, the free encyclopedia
Natural number
← 250251 252 →
Cardinaltwo hundred fifty-one
Ordinal251st
(two hundred fifty-first)
Factorizationprime
Prime54th
Greek numeralΣΝΑ´
Roman numeralCCLI,ccli
Binary111110112
Ternary1000223
Senary10556
Octal3738
Duodecimal18B12
HexadecimalFB16

251 (two hundred [and] fifty-one) is the natural number between250 and252. It is also aprime number.

In mathematics

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251 is:

Every 5 × 5matrix has exactly 251 squaresubmatrices.[7]

References

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  1. ^Sloane, N. J. A. (ed.)."Sequence A005384 (Sophie Germain primes p: 2p+1 is also prime)".TheOn-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  2. ^Sloane, N. J. A. (ed.)."Sequence A109611 (Chen primes)".TheOn-Line Encyclopedia of Integer Sequences. OEIS Foundation.
  3. ^Sloane, N. J. A. (ed.)."Sequence A006285 (Odd numbers not of form p + 2^x (de Polignac numbers))".TheOn-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.)."Sequence A008917 (Numbers that are the sum of 3 positive cubes in more than one way)".TheOn-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.)."Sequence A030662 (Number of combinations of n things from 1 to n at a time, with repeats allowed)".TheOn-Line Encyclopedia of Integer Sequences. OEIS Foundation.
0 to 199
200 to 399
400 to 999
1000s and 10,000s
1000s
10,000s
100,000s to 10,000,000,000,000s


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