a) {132, 264, 396, 528, 660, 792, 924}

b) {104, 105, 106, 107, 108, 109, 204, 205, 206, 207, 208, 209, 304, 305, 306, 307, 308, 309, 404, 405, 406, 407, 408, 409, 504, 505, 506, 507, 508, 509, 604, 605, 606, 607, 608, 609, 704, 705, 706, 707, 708, 709, 804, 805, 806, 807, 808, 809, 904, 905, 906, 907, 908, 909}

c) {129, 138, 147, 156, 165, 174, 183, 192}