15013

This number is a prime.

2^0 + 3^1 + 5^2 + 7^3 + 11^4 = 15013 = Sum_{i=1..5} p(i)^(i-1), where p(i) denotes i-th prime number, is the largest known such prime (as of 13 Feb 2008) and the smallest emirp of that form. [Post]