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triangular number
(mathematics) Any integer that is the sum of n natural numbers from 1 to n.
figurate numbers
plural of figurate number
regnal number
An ordinal number that distinguishes a monarch from others of the same name.
Gödel number
(logic) A number uniquely assigned to each symbol, and to each well-formed formula of some formal language.
Proth number
(number theory) Any number of the form k·2ⁿ + 1, where k is odd, n is a positive integer, and 2ⁿ > k.
matching numbers
(Firearms, on a bolt action rifle), corresponding serial numbers on both the removable bolt and the frame of the rifle.
homogeneous number
A number that shares its prime factors with another.
composite numbers
plural of composite number
distributive number
(grammar) A word that answers "how many times each?" or "how many at a time?"
vanity numbers
plural of vanity number