A094398 Numbers k that divide Lucas(k) + 1.

1, 2, 4, 8, 15, 16, 32, 64, 128, 256, 323, 368, 512, 736, 1024, 1472, 2048, 2944, 4096, 4879, 5655, 5888, 6479, 7055, 8192, 8464, 9879, 10815, 11663, 11776, 12935, 16384, 16928, 18407, 19043, 23407, 23552, 31535, 32768, 33856, 34943, 35207, 35296

Offset: 1

Author

Eric Rowland, May 01 2004

Keywords

• nonn

Comments

The powers of 2 (A000079) are in the sequence. - Michel Lagneau, Feb 09 2015

Links

• Giovanni Resta, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A000079, A000204, A005845, A094402.

Programs

Mathematica

Select[Range[40000],Divisible[LucasL[#]+1,#]&]  (* Harvey P. Dale, Apr 13 2011 *)

PARI

is(n)=(Mod([0,1;1,1],n)^n*[2;1])[1,1]==-1 \\ Charles R Greathouse IV, Nov 04 2016