A composite number is a positive integer that can be formed by multiplying two smaller positive integers. Accordingly it is a positive integer that has...

A highly composite number is a positive integer that has more divisors than all smaller positive integers. If d(n) denotes the number of divisors of a...

In number theory, a superior highly composite number is a natural number which, in a particular rigorous sense, has many divisors. Particularly, it is...

the natural number following 11 and preceding 13. Twelve is the 3rd superior highly composite number, the 3rd colossally abundant number, the 5th highly...

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 composite number...

6 (six) is the natural number following 5 and preceding 7. It is a composite number and the smallest perfect number. A six-sided polygon is a hexagon,...

harmonic divisor number 108,968 = number of signed trees with 11 nodes 109,376 = automorphic number 110,880 = 30th highly composite number 111,111 = repunit...

number, numeral and digit. It is the natural number following 3 and preceding 5. It is a square number, the smallest semiprime and composite number,...

prime number, equal to the sum of 20 and its composite index 11, where 33 is the twenty-first composite number, equal to the sum of 21 and its composite index...

composite number. For example, 5 is prime because the only ways of writing it as a product, 1 × 5 or 5 × 1, involve 5 itself. However, 4 is composite...

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...

natural number following 29 and preceding 31. 30 is an even, composite, and pronic number. With 2, 3, and 5 as its prime factors, it is a regular number and...

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...

168 is the fourth Dedekind number, and the 128th composite number. 168 is the fourth Dedekind number, and one of sixty-five idoneal numbers. It is one...

natural number following 67 and preceding 69. It is an even number. 68 is a composite number and the eighth square-prime. 68 is a composite number; a square-prime...

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...

highly composite number, the 4th colossally abundant number, the 9th highly composite number, a unitary perfect number, and an abundant number. It is...

highly composite number 1,084,051 = fifth Keith prime 1,089,270 = harmonic divisor number 1,111,111 = repunit 1,112,083 = logarithmic number 1,129,30832...

(fifty-seven) is the natural number following 56 and preceding 58. It is a composite number. 57 is semiprime a Blum integer, and a Leyland number. The split Lie algebra...

= number of partitions of 28 such that the number of odd parts is a part 1206 = 29-gonal number 1207 = composite de Polignac number 1208 = number of...

See Waring's problem. The twenty-third highly composite number 20,160 is one less than the last number (the 339th super-prime 20,161) that cannot be expressed...

33 (thirty-three) is the natural number following 32 and preceding 34. 33 is the 21st composite number, and 8th distinct semiprime (third of the form...

the natural number following 57 and preceding 59. 58 is a composite number with four factors: 1, 2, 29, and 58. Other than 1 and the number itself, 58...

In number theory, a Carmichael number is a composite number ⁠ n {\displaystyle n} ⁠ which in modular arithmetic satisfies the congruence relation: b n...

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

Minim friar, who studied them in the early 17th century. If n is a composite number then so is 2n − 1. Therefore, an equivalent definition of the Mersenne...

natural number. 2 is the smallest and the only even prime number, and the first Ramanujan prime. It is also the first superior highly composite number, and...

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 also...

composite number, or it is not, in which case it is a prime number. For example, 15 is a composite number because 15 = 3 · 5, but 7 is a prime number...

superior highly composite number. the 7th colossally abundant number. the 18th highly composite number. the last highly composite number that is half of...