• Source 
    1. /* package whatever; // don't place package name! */
    2.  
    3. import java.util.*;
    4. import java.lang.*;
    5. import java.io.*;
    6.  
    7. /* Name of the class has to be "Main" only if the class is public. */
    8. class Ideone
    9. {
    10. 	public static void main (String[] args) throws java.lang.Exception
    11. 	{
    12. 		for(int i=2;i<1000;i++){
    13. 			boolean x=true;
    14. 			for(int s=2;s<i;s++){
    15. 				if(i%s<1){
    16. 					x=false;
    17. 				}
    18. 			}
    19. 			if(x)System.out.print(i+":");
    20. 		}
    21. 	}
    22. }