Srinivasa Ramanujan

22 December 1887 -26 April 1920 (aged 32) Chetput, (Madras), India

       Ramanujan Number/Hardy-Ramanujan Number

A common anecdote about Ramanujan relates to the number 1729. Hardy arrived at Ramanujan's residence in a cab numbered 1729. Hardy commented that the number 1729 seemed to be uninteresting. Ramanujan is said to have stated on the spot that it was actually a very interesting number mathematically, being the smallest natural number representable in two different ways as a sum of two cubes:

1729 = 1³ + 12³ = 9³ + 10³

^{91 = 63 + (−5)3 = 43 + 33  (91 is divisor of 1729)}

^{Masahiko Fujiwara showed that 1729 is}

^{1 + 7 + 2 + 9 = 19}

^{19 × 91 = 1729}

^{Ramanujan Known for : Landau-Ramanujan Constant}

                                            ^{Mock theta functions}

                                 Ramanujan Prime

                                 Ramanujan's Sum