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

Offset

0,1

Links

Table of n, a(n) for n=0..52.

Crossrefs

Cf. A001358, A085727.

Sequence in context: A126624 A109334 A370916 * A195955 A374806 A127194

Adjacent sequences: A085725 A085726 A085727 * A085729 A085730 A085731

Keyword

nonn

Author

Jason Earls, Jul 20 2003

Extensions

More terms from Ray Chandler, Nov 22 2003

Status

approved