Problem 34

145 is a curious number, as 1! + 4! + 5! = 1 + 24 + 120 = 145.

Find the sum of all numbers which are equal to the sum of the factorial of their digits.

Note: as 1! = 1 and 2! = 2 are not sums they are not included.

C++:

#include 
     
      using namespace std;const int MAX = 2540160;const int N = 10;long factorials[N] = {1, 1};int main(){    for(int i=2; i