/* Prints prime numbers, dividable evenly only by itself and one */

#include <stdio.h>

#define N 99

int main(void)
{
  int i, j;
  i = 1;
  printf ("%5d", i);
  while (i < N)
    {
      i++;
      j = 2;
      while (i % j != 0) j++;
      if (j == i) printf ("%5d", i);
    }
  printf ("\n");
}