public static boolean isDiv ( String s ) {
	two = Integer.parseInt(s.substring(1,4));
	three = Integer.parseInt(s.substring(2,5));
        five = Integer.parseInt(s.substring(3,6));
	seven = Integer.parseInt(s.substring(4,7));
        eleven = Integer.parseInt(s.substring(5,8));
        thirteen = Integer.parseInt(s.substring(6,9));
	seventeen = Integer.parseInt(s.substring(7,10));
	if ( two%2==0 && three%3==0 && five%5==0 && seven%7==0 && eleven%11==0 && thirteen%13==0 && seventeen%17==0 ) {
	    return true;
	}
	return false;
    }