Prove that every prime number other than 2, can be expressed as a difference of two squares.

- Princeton Math Club Website

(In reply to Isnt this true for any odd number? by Vishal Gupta)

Yes, it looks like the word "prime", rather than "odd" was used as a red herring, to prevent the proof from being too obvious.

Posted by Charlie on 2010-09-14 15:41:31