#include <stdio.h>



// Find all primes that end in 1
void findprimes(int limit)
{
    int i;
    for (i=2;i<limit;++i) {
	int j;
	if (i%10!=1) {		/* try next i */
	    continue;
	}
	for (j=2;j<i;++j) {
	   if (i%j==0) {
	     break;		/* we know it isn't prime so stop looking */
	   }
	}
	if (j==i) {
	    printf("%d \n",i);
	}
    }
}


int main()
{
    findprimes(10000);
    return 0;
}