A127106 - OEIS

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A127106

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

%I #6 Mar 31 2012 13:20:34

%S 1,5,1555,9673655,187159211791705,776119592182705

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

%C Subsequence of A014946.

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

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

%K hard,more,nonn

%O 1,2

%A _Alexander Adamchuk_, Jan 05 2007

%E Two more terms from _Max Alekseyev_, May 05 2010