[Solved] Find all prime factors of a given number

Your code works just fine if you remove this triangularNum:

#include <stdio.h>

int main()
{
  int a, n;
  scanf("%d", &n);

  for (a=2; a<=n; ++a)
  {
    while(n%a==0)
    {
      printf("%d\t", a);
      n = n/a;
    }
  }
}