A132829 Numbers k such that 3^k + 2 is not prime.

5, 6, 7, 9, 11, 12, 13, 16, 17, 18, 19, 20, 21, 22, 23, 25, 27, 28, 29, 30, 31, 32, 33, 34, 35, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83

Offset

1,1

Links

Table of n, a(n) for n=1..71.

Mathematica

a = {}; c = 3^x + 2; Do[If[PrimeQ[c], 0, AppendTo[a, x]], {x, 0, 100}]; a
Select[Range[90], CompositeQ[3^#+2]&] (* Harvey P. Dale, Sep 25 2021 *)

Prog

(Magma) [n: n in [0..100]| not IsPrime(3^n+2)] // Vincenzo Librandi, Jan 28 2011

Crossrefs

Cf. A057735, A051783.

Sequence in context: A089192 A279195 A232710 * A180061 A196029 A096820

Adjacent sequences: A132826 A132827 A132828 * A132830 A132831 A132832

Keyword

nonn

Author

Artur Jasinski, Sep 03 2007

Status

approved