One of the most important Indian mathematicians who has made significant contributions in the field of mathematics is Srinivasa Ramanujan. He has made several contributions to number theory. His birthday December 22 is celebrated as National Mathematical Day and his 125th birth anniversary as on 2012 and so this year was declared as the National Mathematical Year. "The Man who knew infinity" is the biography of Srinivasa Ramanujan. There is a number associated with Ramanujan called the Ramanujan number. It is 1729. It is the smallest number that can be expressed as the sum of cubes of numbers in two different ways :
 10³+1³=1729 and 1³+12³=1729
Srinivasa ramanujan  was one f the greatest indian mathematician.he made contribution to the analytical theory of numbers.he was born in is grndmothers house in erode on 22nd december 1887.  hither use to work in kumbakonam as a clerk ina cloth merchants shop. when he was of five years old he attended      his      school in 1900 he began to work on his own mathematics suming gometric and arthemetic series.