Ramanujan Srinivasa Iyengar - Ramanujan's interpretation of Prof. Hardy's Vehicle registration number 1729.

The smallest number that can be expressed as the sum of cubes of two different pair of numbers (10cube + 9 cube=1729; 12cube+1cube=1729) This was the registration number of Professor Hardy's car. As Hardy was unhappy about the number his student Ramanujan told him this was a wonderful number. This happened in the hospital when Hardy visited Ramanujan