Posted by John on Tuesday, February 19, 2013 at 4:49am.
Find the sum of all primes a<1000, such that a^k +1 = b^{m+1} for some positive integers k,b,m.

Math  Steve, Tuesday, February 19, 2013 at 12:45pm
Hmm. The only such I can come up with is 2^3+1 = 3^2