A173968 Sums of 3 consecutive semiprimes.

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

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. A001358, 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