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...

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...

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...

(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...

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...

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

(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...

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...

82 (eighty-two) is the natural number following 81 and preceding 83. 82 is: the twenty-seventh semiprime and the thirteenth of the form (2.q). with an...

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...

In number theory, a semiperfect number or pseudoperfect number is a natural number n that is equal to the sum of all or some of its proper divisors. A...

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...

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

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...

The number e is a mathematical constant approximately equal to 2.71828 that is the base of the natural logarithm and exponential function. It is sometimes...

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

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...

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...

(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...

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...

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:...

16 (sixteen) is the natural number following 15 and preceding 17. It is the fourth power of two. In English speech, the numbers 16 and 60 are sometimes...

LXIX) is the natural number following 68 and preceding 70. An odd number and a composite number, 69 is divisible by 1, 3, 23 and 69. The number and its pictograph...

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...

39 (thirty-nine) is the natural number following 38 and preceding 40. 39 is the 12th distinct semiprime and the 4th in the (3.q) family. It is the last...

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...

the natural number that follows 41 and precedes 43. 42 is a pronic number, an abundant number as well as a highly abundant number, a practical number, an...