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.