My Erdös Number is =  3
   Paul Erdös (0) -> 
         [Noga Alon (1), Daniel J. Kleitman (1), Jeffery O. Shallit (1), Joel Spencer (1)]
             -> Michael O. Rabin (2) 
                 -> Partha Dasgupta(3)

For a description of Erdös Numbers, click here.