A217851 Least semiprime m such that the previous semiprime is m - A215231(n).

6, 9, 14, 21, 33, 106, 611, 1437, 2701, 6583, 16078, 17993, 32807, 35135, 36019, 340941, 1069595, 1589717, 3586913, 5835265, 139139963, 251306399, 285074774, 327023293, 751412039, 981270997, 2655397729, 5238281053, 6498130471, 8512915685, 16328958739

Offset

1,1

Comments

These are the semiprimes that are the upper end of the gaps of length A215231. The lower end semiprimes are given in A215232.

Links

Martin Raab, Table of n, a(n) for n = 1..43 (terms 1..38 from Donovan Johnson).

Crossrefs

Cf. A001358 (semiprimes), A131109, A215231, A215232.

Sequence in context: A154778 A316014 A106350 * A218697 A361696 A316015

Adjacent sequences: A217848 A217849 A217850 * A217852 A217853 A217854

Keyword

nonn,hard

Author

T. D. Noe, Nov 07 2012

Status

approved