251 (number)

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← 250 251 252 →
Cardinal two hundred fifty-one
Ordinal 251st
(two hundred fifty-first)
Factorization prime
Prime 54th
Greek numeral ΣΝΑ´
Roman numeral 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. [6]

Related Research Articles

23 (twenty-three) is the natural number following 22 and preceding 24.

29 (twenty-nine) is the natural number following 28 and preceding 30. It is a prime number.

64 (sixty-four) is the natural number following 63 and preceding 65.

1000 or one thousand is the natural number following 999 and preceding 1001. In most English-speaking countries, it can be written with or without a comma or sometimes a period separating the thousands digit: 1,000.

300 is the natural number following 299 and preceding 301.

400 is the natural number following 399 and preceding 401.

500 is the natural number following 499 and preceding 501.

700 is the natural number following 699 and preceding 701.

600 is the natural number following 599 and preceding 601.

800 is the natural number following 799 and preceding 801.

900 is the natural number following 899 and preceding 901. It is the square of 30 and the sum of Euler's totient function for the first 54 positive integers. In base 10 it is a Harshad number. It is also the first number to be the square of a sphenic number.

It is:

3000 is the natural number following 2999 and preceding 3001. It is the smallest number requiring thirteen letters in English.

4000 is the natural number following 3999 and preceding 4001. It is a decagonal number.

5000 is the natural number following 4999 and preceding 5001. Five thousand is, at the same time, the largest isogrammic numeral, and the smallest number that contains everyone of the five vowels in the English language.

6000 is the natural number following 5999 and preceding 6001.

7000 is the natural number following 6999 and preceding 7001.

8000 is the natural number following 7999 and preceding 8001.

30,000 is the natural number that comes after 29,999 and before 30,001.

9000 is the natural number following 8999 and preceding 9001.

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.). "SequenceA006285(Odd numbers not of form p + 2^x (de Polignac numbers))". The On-Line Encyclopedia of Integer Sequences . OEIS Foundation.
  3. ↑ 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 .
  4. ↑ 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.
  5. ↑ De Koninck, Jean-Marie (2009), Those fascinating numbers, Providence, RI: American Mathematical Society, p. 64, ISBN   978-0-8218-4807-4, MR   2532459 .
  6. ↑ 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.
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