properties. The natural numbers form a set, commonly symbolized as a bold N or blackboard bold ⁠ N {\displaystyle \mathbb {N} } ⁠. Many other number sets are...

is the natural number following 599 and preceding 601. Six hundred is a composite number, an abundant number, a pronic number, a Harshad number and a largely...

700 (seven hundred) is the natural number following 699 and preceding 701. It is the sum of four consecutive primes (167 + 173 + 179 + 181), the perimeter...

1729 is the natural number following 1728 and preceding 1730. It is the first nontrivial taxicab number, expressed as the sum of two cubic positive integers...

900 (nine hundred) 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...

is the natural number following 799 and preceding 801. It is the sum of four consecutive primes (193 + 197 + 199 + 211). It is a Harshad number, an Achilles...

(two) is a number, numeral and digit. It is the natural number following 1 and preceding 3. It is the smallest and the only even prime number. Because it...

50 (fifty) is the natural number following 49 and preceding 51. Fifty is the smallest number that is the sum of two non-zero square numbers in two distinct...

In number theory, a lucky number is a natural number in a set which is generated by a certain "sieve". This sieve is similar to the sieve of Eratosthenes...

11 (eleven) is the natural number following 10 and preceding 12. It is the smallest number whose name has three syllables. "Eleven" derives from the Old...

43 (forty-three) is the natural number following 42 and preceding 44. 43 is a prime number, and a twin prime of 41. 43 is the smallest prime that is not...

(sixty-seven) is the natural number following 66 and preceding 68. It is an odd and prime number. 67 is: the 19th prime number (the next is 71). a Chen...

A prime number (or a prime) is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that...

a vampire number (or true vampire number) is a composite natural number with an even number of digits, that can be factored into two natural numbers each...

143 (one hundred [and] forty-three) is the natural number following 142 and preceding 144. It is one less than a gross. On Mister Rogers' Neighborhood:...

the natural number following 98 and preceding 100. 99 is: a composite number; a square-prime, of the form (p2, q). It is the 11th composite number of this...

(five hundred) is the natural number following 499 and preceding 501. 500 = 22 × 53. It is an Achilles number and a Harshad number, meaning it is divisible...

9999 is the natural number following 9998 and preceding 10000. 9999 is an auspicious number in Chinese folklore. Many estimations of the rooms contained...

25 (twenty-five) is the natural number following 24 and preceding 26. It is a square number, being 52 = 5 × 5, and hence the third non-unitary square...

73 (seventy-three) is the natural number following 72 and preceding 74. In English, it is the smallest natural number with twelve letters in its spelled...

dictionary. 2000 (two thousand) is a natural number following 1999 and preceding 2001. It is: the highest number expressible using only two unmodified...

(ninety-eight) is the natural number following 97 and preceding 99. 98 is: a Wedderburn–Etherington number a nontotient a number of non-isomorphic set-systems...

is the natural number following 95 and preceding 97. It is a number that appears the same when rotated by 180 degrees. 96 is: an octagonal number. a refactorable...

the natural number following 55 and preceding 57. 56 is: The sum of the first six triangular numbers (making it a tetrahedral number). The number of ways...

is the natural number following 19 and preceding 21. A group of twenty units is sometimes referred to as a score. Twenty is a composite number. It is...

666 (six hundred [and] sixty-six) is the natural number following 665 and preceding 667. In Christianity, 666 is referred to in most manuscripts of chapter...

unit, unity) is a number, numeral, and glyph. It is the first and smallest positive integer of the infinite sequence of natural numbers. This fundamental...

A number is a mathematical object used to count, measure, and label. The most basic examples are the natural numbers 1, 2, 3, 4, and so forth. Numbers...

(eighteen) is the natural number following 17 and preceding 19. It is an even composite number. 18 is a semiperfect number and an abundant number. It is a largely...

59 (fifty-nine) is the natural number following 58 and preceding 60. Fifty-nine is the 17th prime number, and 7th super-prime. It is also a good prime...