function happyNumber(num) { var a, b ; var c = [ ]; while(num != 1 && c[num] !== true) { c[num] = true ; a = 0 ; while (num > 0) { b = num % 10 ; a += b * b ; num = (num - b) / 10 ; } num = a ; } return (num == 1) ; } var count = 5; var num = 1; var f5 = ''; while(count-- > 0) { while(!happyNumber(num)) num++ ; f5 = f5+(num + "\n") ; num++ ; } console.log(f5);