I don't know Colin's logic, but my personal reasoning would be:
1. If this were true then it gives a simple, efficient, deterministic method to test for primes. (You can compute P_n modulo n efficiently using matrix exponentiation.)
2. If there was such a method I am sure I would have heard of it before - and people wouldn't bother using Miller-Rabin or the complicated deterministic primality method
1. If this were true then it gives a simple, efficient, deterministic method to test for primes. (You can compute P_n modulo n efficiently using matrix exponentiation.)
2. If there was such a method I am sure I would have heard of it before - and people wouldn't bother using Miller-Rabin or the complicated deterministic primality method
3. Therefore there must be a flaw...