plural of Schröder number

(combinatorics) Any of the triangular array of natural numbers defined by N(n, k), n = 1, 2, 3 ..., 1 ≤ k ≤ n, occurring in various counting problems.

plural of Lychrel number

(mathematics) A natural number that cannot form a palindrome through the iterative process of repeatedly reversing its digits and adding the resulting numbers.

plural of plate number coil

(philately) A United States postage stamp with the number of the printing plate or plates printed on it.

plural of prime number theorem

(number theory) The theorem that the number of prime numbers less than n asymptotically approaches n / ln(n) as n approaches infinity.

(number theory) A positive integer whose abundancy index is greater than that of any lesser positive integer. / Used other than figuratively or idiomatically: see superabundant, number.

plural of negative number