A132830 Numbers of the form 3^n+2 which are not primes.

245, 731, 2189, 19685, 177149, 531443, 1594325, 43046723, 129140165, 387420491, 1162261469, 3486784403, 10460353205, 31381059611, 94143178829, 847288609445, 7625597484989, 22876792454963, 68630377364885, 205891132094651

Offset

1,1

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Mathematica

a = {}; c = 3^x + 2; Do[If[PrimeQ[c], 0, AppendTo[a, c]], {x, 0, 100}]; a (*Artur Jasinski*)
Select[3^Range[0, 30]+2, !PrimeQ[#]&] (* Harvey P. Dale, Nov 21 2012 *)

Crossrefs

Cf. A057735, A051783, A132829.

Sequence in context: A137521 A257781 A188239 * A350421 A236887 A237161

Adjacent sequences: A132827 A132828 A132829 * A132831 A132832 A132833

Keyword

nonn

Author

Artur Jasinski, Sep 03 2007

Status

approved