It was conjectured by the French mathematician [[Pierre de Fermat]]. He said he had proved this problem but that there was not enough room in the margin to state his proof:<ref>Nagell 1951, p. 252.</ref> | It was conjectured by the French mathematician [[Pierre de Fermat]]. He said he had proved this problem but that there was not enough room in the margin to state his proof:<ref>Nagell 1951, p. 252.</ref> |