See http://numbersapi.com/1729 http://numbersapi.com/1729: > 1729 is the smallest number representable in two different ways as a sum of two positive cubes, as

See http://numbersapi.com/1729 http://numbersapi.com/1729: > 1729 is the smallest number representable in two different ways as a sum of two positive cubes, as Ramanujan stated on the spot.