A085728 There are never n semiprimes between any k and 2k; or values which do not occur in the sequence of number of semiprimes between n and 2n (inclusive).

10, 19, 32, 45, 70, 81, 99, 125, 134, 154, 157, 183, 185, 189, 193, 236, 238, 245, 260, 269, 282, 300, 303, 313, 333, 341, 352, 354, 359, 371, 381, 384, 394, 397, 417, 453, 464, 527, 532, 562, 564, 595, 601, 606, 615, 620, 633, 641, 654, 670, 690, 699, 708