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A254712 Semiprimes that are the sum of five successive semiprimes. 3
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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
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
Sequence in context: A015980 A065209 A045021 * A197172 A253154 A140368
KEYWORD
nonn
AUTHOR
Zak Seidov, Feb 06 2015
STATUS
approved

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Last modified April 20 03:03 EDT 2024. Contains 371798 sequences. (Running on oeis4.)