Consider the divisors of 30: 1,2,3,5,6,10,15,30.
It can be seen that for every divisor d of 30, d+30/d is prime.
Find the sum of all positive integers n not exceeding 100 000 000
such that
for every divisor d of n, d+n/d is prime.
These problems are part of Project Euler and are licensed under CC BY-NC-SA 2.0 UK