Fermat's Last Theorem finally proved after 358 years

For 358 years, mathematicians were stumped by Fermat's Last Theorem, a puzzle proposed in 1637. French mathematician Pierre de Fermat claimed he had a "marvelous proof" that no three positive integers a, b, and c could satisfy a^n + b^n = c^n for n greater than 2, but never wrote it down. This margin note became one of history's greatest mathematical challenges.