A254712 Semiprimes that are the sum of five successive semiprimes.

69, 82, 166, 417, 451, 545, 614, 679, 717, 731, 763, 779, 799, 813, 851, 1047, 1057, 1077, 1101, 1119, 1138, 1262, 1293, 1346, 1371, 1603, 1639, 1651, 1678, 1739, 1761, 1817, 1897, 1959, 1983, 2049, 2078, 2177, 2263, 2446, 2498, 2533, 2661, 2705, 2734, 2746, 2762

Offset

1,1

Links

Zak Seidov, Table of n, a(n) for n = 1..10000

Example

69=A001358(24)=A001358(3)+...+A001358(7)= 9 + 10 + 14 + 15 + 21,
82=A001358(27)=A001358(4)+...+A001358(8)= 10 + 14 + 15 + 21 + 22.

Mathematica

Module[{sps=Select[Range[750], PrimeOmega[#]==2&]}, Select[Total/@ Partition[ sps, 5, 1], PrimeOmega[ #] ==2&]] (* Harvey P. Dale, Nov 11 2021 *)

Crossrefs

Cf. A001358, A092192, A131610, A158339.

Sequence in context: A015980 A065209 A045021 * A197172 A253154 A140368

Adjacent sequences: A254709 A254710 A254711 * A254713 A254714 A254715

Keyword

nonn

Author

Zak Seidov, Feb 06 2015

Status

approved