This is a tribute to an Indian genius Srinivasa Ramanujan, who observed that 1729 is the smallest number that is the sum of two positive cubes in two different ways. (1729 = 10^3 + 9^3 = 12^3 + 1^3.)

Ramanujan first started thinking about the number 1729 when he was visited by the mathematician G. H. Hardy, who had come to see him in a taxi with this number.