HW4.20

 public class Solution
 {
     public static void main(String[] args)
     {
         boolean isPrime = true;
         int count = 0;
         for(int i = 2; i <= 1000; i++)
         {
             for(int j = 2; j < i; j++)
             {
                 if(i % j == 0)
                 {
                     isPrime = false;
                     break;
                 }
                 isPrime = true;
             }

             if(isPrime)
             {
                 System.out.print(i + " ");
                 count++;
             }
             if(count == 10)
             {
                 System.out.println();
                 count = 0;
             }
         }
     }
 }