Ibn al-Haytham is amazing! According to wiki (http://en.wikipedia.org/wiki/Ibn_al-Haytham)... "His contributions to number theory includes his work on perfect numbers. In his Analysis and Synthesis, Ibn al-Haytham was the first to realize that every even perfect number is of the form 2n−1(2n − 1) where 2n − 1 is prime, but he was not able to prove this result successfully (Euler later proved it in the 18th century).[10]"
And his amazing work on optics which laid the foundation for Western optical science. amazing.
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