import java.util.*; public class Main{ public static boolean isPrime(int n){ if(n<2) return false; for(int i = 2; i<=Math.sqrt(n);i++){ if(n%i==0) return false; } return true; } public static void main(String args[]){ int i,a,b; for(i=10;i<=99;i++){ a=i%10; b=i/10; if(isPrime(i)&&isPrime(a*10+b)) System.out.println(i); } } } /************************************************************** Problem: 1513 User: admin Language: Java Result: Accepted Time:273 ms Memory:34368 kb ****************************************************************/