(mathematics) A composite number n that satisfies the modular arithmetic congruence relation bⁿ⁻¹≡1(mod n) for all integers 1<b<n that are relatively prime to n.

(mathematics) A squarefree positive integer d such that the imaginary quadratic field Q(√(−d)) has class number 1; equivalently, such that its ring of integers has unique factorization.

Any of many games based upon numbers.

(game theory) Synonym of nimber

plural of Grundy number

plural of L-number

Any of the identification numbers used in an informal system for classifying catfish before they have an scientific name.

plural of carbon number

(organic chemistry) The number of carbon atoms in each molecule of a compound.

plural of occupation number