plural of edge number

A sequential identification code on the edge of film, used to locate individual frames when working with sections of the film.

plural of epsilon number

(set theory) Any (necessarily transfinite) ordinal number α such that ω^α = α; (by generalisation) any surreal number that is a fixed point of the exponential map x → ωˣ.

(algebra) split-complex number

plural of Sierpinski number

(UK politics, colloquial) Synonym of 11 Downing Street

plural of hyperperfect number

(mathematics, number theory) Any natural number n for which, for some positive integer k, n = 1 + k(σ(n) - n - 1), where σ(n) is the sum of the positive divisors of n.

A squarefree integer with at least three prime factors which fall into the pattern p_x=ap_x-1+b, where a and b are some integer constants and x is the index number of each prime factor in the factorization, sorted from lowest to highest.