## Prime Subset Sums

### Problem 249

Published on Saturday, 13th June 2009, 05:00 am; Solved by 1680; Difficulty rating: 60%Let `S` = {2, 3, 5, ..., 4999} be the set of prime numbers less than 5000.

Find the number of subsets of `S`, the sum of whose elements is a prime number.

Enter the rightmost 16 digits as your answer.