Fermat's last theorem was a mathematical result written down by Fermat in 1637; but after his death in 1665 no-one could find any evidence that he had actually proved his theorem. When was the result finally proved?
In number theory, Fermat's Last Theorem states that no three positive integers a, b, and c satisfy the equation a^n + b^n = c^n (where a^n means "a raised to the power of n") for any integer value of n greater than two. The cases where n = 1 and n = 2 have long been known to have infinitely many solutions. This theorem was first conjectured by Pierre de Fermat in 1637 in the margin of a copy of Arithmetica where he claimed he had a proof that was too large to fit in the margin.
A lot of time (358 years, to be specific) has passed before the first successful proof of the most difficult mathematical problem of all time was released and published. Andrew Wiles, a British mathematician born in 1953, released the proof in 1994. It was officially published in 1995. This very theorem became a powerful motivation for the development of algebraic number theory in the 19th and 20th centuries. The theorem had more unsuccessful proofs than any other one known.