1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 21, 22, 31, 33, 41, 42, 44, 51, 55, 61, 62, 63, 66, 71, 77, 81, 82, 84, 88, 91, 93, 99, 111, 211, 221, 222, 311, 331, 333, 411, 421, 422, 441, 442, 444, 511, 551, 555, 611, 621, 622, 631, 633, 661, 662, 663, 666, 711, 771, 777, 811, 821
