A031888 Lucky numbers with size of gaps equal to 6 (lower terms).

15, 25, 37, 43, 87, 93, 99, 105, 135, 163, 195, 205, 261, 267, 297, 321, 361, 385, 393, 409, 415, 421, 477, 489, 511, 529, 553, 645, 673, 679, 693, 717, 729, 781, 867, 897, 1023, 1087, 1095, 1117, 1183, 1203, 1275, 1285, 1303, 1323, 1389