Date: Oct 25, 2009 5:03 PM
Author: gaya.patel@gmail.com
Subject: for all integers x coprime to n, x^(n-1) = 1 mod n -> that n square <br>	free

How can I show that if for all integers x coprime to n,  x^(n-1) = 1
(mod n), then n is necessarily square free?