Primes of the form n^2 - 1?

[cino hilliard]

>From: Jud McCranie <j.mccranie at adelphia.net>

>>There are plenty of primes of the form n^2 + 1 (even if it's not known
>>whether they're infinite) but are there any primes of the form n^2 - 1
>>besides 3?
>>
>>Is there some well-known theorem or conjecture on the subject I have 
>>overlooked?
>

>I conjecture that n^2-1 factors into (n-1)(n+1) and none of them are prime, 
>except when n=2.

Good one Jud.:-)