3, 27, 51, 57, 71, 81, 83, 87, 93, 99, 107, 137, 141, 173, 207, 209, 213, 237, 251, 257, 303, 311, 333, 341, 393, 417, 443, 447, 461, 473, 477, 489, 491, 509, 513, 521, 527, 531, 549, 557, 579, 591, 593, 603, 621, 627, 683, 701, 711, 713, 731, 737, 747, 759