A089644 Numbers n such that 7 divides the numerator of B(2n) where B(2n) = the 2n-th Bernoulli number.

7, 14, 28, 35, 49, 56, 70, 77, 91, 98, 112, 119, 133, 140, 154, 161, 175, 182, 196, 203, 217, 224, 238, 245, 259, 266, 280, 287, 301, 308, 322, 329, 343, 350, 364, 371, 385, 392, 406, 413, 427, 434, 448, 455, 469, 476, 490, 497, 511, 518, 532, 539, 553, 560