A115776 Integers i such that 13*i = A048720bi(21,i), but 15*i <> A048720bi(23,i).

15, 30, 31, 45, 47, 60, 61, 62, 63, 90, 94, 95, 120, 122, 124, 125, 126, 127, 165, 173, 175, 180, 181, 188, 189, 190, 191, 240, 244, 245, 248, 250, 252, 253, 254, 255, 330, 346, 350, 351, 360, 362, 376, 378, 380, 381, 382, 383, 480, 488, 490, 496, 500