public static void main(String[] args){
        int y;
        Random r = new Random();
        for(int x = 0; x < 20; x++){
            y = r.nextInt(27) + 47;
            if (y % 3 = 0){
                System.out.println("#" + y + " ");
            } else {
                System.out.println(y + " ");
            }
        }
    }

if (y % 3 = 0){

if (y % 3 == 0){