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A173968 Sums of 3 consecutive semiprimes. 1
102, 258, 282, 366, 426, 606, 642, 654, 906, 1182, 1338, 1902, 2094, 2526, 2766, 3126, 3414, 3786, 4038, 4206, 4926, 5286, 5514, 5682, 5826, 5946, 6306, 6546, 6654, 6918, 7086, 7302, 7386, 7554, 7926, 8166, 8202, 9294, 10158, 10806, 11082, 11598, 11706 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

33 + 34 + 35 = 102,..

LINKS

Table of n, a(n) for n=1..43.

MATHEMATICA

f[n_]:=Last/@FactorInteger[n]=={1, 1}||Last/@FactorInteger[n]=={2}; lst={}; Do[If[f[n], If[f[n+1]&&f[n+2], AppendTo[lst, 3*n+3]]], {n, 8!}]; lst

CROSSREFS

Cf. A173966, A173967

Sequence in context: A160850 A202052 A284450 * A173969 A140062 A203407

Adjacent sequences:  A173965 A173966 A173967 * A173969 A173970 A173971

KEYWORD

nonn

AUTHOR

Vladimir Joseph Stephan Orlovsky, Mar 03 2010

STATUS

approved

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Last modified May 30 06:51 EDT 2017. Contains 287302 sequences.