Srinivasa Ramanujan, also known as Ramanujan,18871February 22, 920-1April 26, 920, male, is one of the most famous mathematicians in Indian history.

He has no formal higher mathematics education and is addicted to number theory, especially the summation formula involving π, prime numbers and other mathematical constants, as well as integer division. I'm used to deriving formulas by intuition (or by leaps and bounds), and I don't like proof (he is often proved right afterwards).