For a given set of coprime positive integers, the greatest integer that cannot be expressed as a linear combination (with nonnegative integer coefficients) of its elements.

plural of Frobenius number

plural of mesh number

plural of number plate

(law) a number that represents information which is illegal to possess, utter or propagate. Any information that can be represented in binary format is, ipso facto, representable as a number, and therefore if the information itself is illegal in some way, the pure number itself may be called illegal.

plural of regnal number

(logic) A number uniquely assigned to each symbol, and to each well-formed formula of some formal language.

plural of PIN number

An ordinal number that distinguishes a monarch from others of the same name.

plural of practical number