What is the sum of the reciprocals of all prime numbers? (i.e. 1/2 + 1/3 + 1/5 + 1/7...)

(In reply to None by DJ)

A nice reference (with Euler's proof) is Hua's Introduction to Number Theory. See also Proofs from the Book.

Posted by Richard on 2003-12-24 13:47:41