Carmichael number
= Carmichael number
{c}
{wiki}
A composite $N$ is Carmichael when $a^{N-1}\equiv1\pmod N$ for every $a$ coprime to $N$.
= Carmichael number
{c}
{wiki}
A composite $N$ is Carmichael when $a^{N-1}\equiv1\pmod N$ for every $a$ coprime to $N$.