A127106 Numbers n such that n^2 divides 6^n-1.

1, 5, 1555, 9673655, 187159211791705, 776119592182705

Offset

1,2

Comments

Subsequence of A014946.

Links

Table of n, a(n) for n=1..6.

Mathematica

Select[Range[20000], IntegerQ[(PowerMod[6, #, #^2 ]-1)/#^2 ]&]

Crossrefs

Cf. A127100, A127101, A127102, A127103, A127104, A127105, A127107, A127092, A014946.

Sequence in context: A165628 A119747 A177906 * A165877 A366830 A123658

Adjacent sequences: A127103 A127104 A127105 * A127107 A127108 A127109

Keyword

hard,more,nonn

Author

Alexander Adamchuk, Jan 05 2007

Extensions

Two more terms from Max Alekseyev, May 05 2010

Status

approved