A061411 m.2^n-1 is not prime for all coefficients m in the range 0<=m<=n.

1, 22, 24, 65, 110, 112, 135, 137, 166, 167, 218, 219, 220, 228, 229, 239, 257, 280, 310, 344, 345, 346, 398, 399, 403, 404, 405, 430, 439, 440, 475, 494, 504, 505, 508, 522, 524, 534, 535, 536, 557, 559, 592, 619, 620, 624, 625, 626, 679, 703, 705, 706