Wilson's theorem

Intro

YouTube videos

247What do 5, 13 and 563 have in common?
Numberphile

Proof

\((n - 1)! \equiv -1 \pmod{n}\)

Wilson's Theorem (extra footage)

Numberphile2

Number Theory | Wilson's Theorem

Michael Penn

Number Theory: Wilson's Theorem

Socratica

A proof of Wilson's Theorem

The Prime Pages