A127106 - OEIS

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A127106

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

42

1, 5, 1555, 9673655, 187159211791705, 776119592182705

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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