A179209 Numbers k such that 2^(2*k-1) mod (2*k+1) = 2.

1, 4, 7, 10, 16, 19, 25, 28, 31, 34, 43, 46, 55, 61, 64, 70, 79, 88, 91, 97, 100, 106, 109, 118, 124, 133, 145, 151, 154, 157, 160, 163, 169, 190, 196, 199, 205, 208, 223, 226, 235, 244, 250, 259, 268, 271, 286, 289, 295, 298, 316, 334, 340, 343, 346, 349, 358, 361, 365, 376, 385, 394

Offset: 1

Author

Juri-Stepan Gerasimov, Jan 05 2011

Keywords

• nonn

Links

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

Crossrefs

Cf. A000079, A178970, A179003.

Programs

Mathematica

Select[Range[400],PowerMod[2,2#-1,2#+1]==2&] (* Harvey P. Dale, Aug 16 2012 *)

Formula

{ k : A178970(n) = 2 }.