Date: Mar 14, 2013 9:59 PM
Author: Brian Q. Hutchings
Subject: From Fermat little theorem to 'la theoreme "dernier" du Fermat -- and<br> the next one'

Furthermore, this may have been one of his earliest proofs
> in the theory of numbers -- which science he created,
> mostly using right trigona -- and this is highlighted
> by the fact taht he *later* produced the proof
> for teh very special case of the exponent, n = 4. All
> of the other cases can be made for only prime exponents,
> since it is easy to prove that composite exponents
> -- other than 2x2 -- reduce to the case for prime ones.