Carmichael number

English

Etymology

Named after Robert Daniel Carmichael (1879–1967), American mathematician.

Noun

Carmichael number (plural Carmichael numbers)

1. (mathematics) A composite number $n$ that satisfies the modular arithmetic congruence relation $b^{n-1}\equiv 1{\pmod {n}}$ for all integers $1<b<n$ that are relatively prime to $n$.