(mathematics) Any of the large semiprime numbers to be factored in the RSA Factoring Challenge, a competition from 1991 to 2007 encouraging research into computational number theory.

plural of RSA number

plural of composite number

plural of Greek number

plural of magic number

plural of proton number

(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.

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

plural of regnal number

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