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 A211243 Order of 7 mod n-th prime: least k such that prime(n) divides 7^k-1. 7

%I

%S 1,1,4,0,10,12,16,3,22,7,15,9,40,6,23,26,29,60,66,70,24,78,41,88,96,

%T 100,51,106,27,14,126,65,68,69,74,150,52,162,83,172,178,12,10,24,98,

%U 99,210,37,113,228,116,238,240,125,256,262,268,135,138,20,141,292

%N Order of 7 mod n-th prime: least k such that prime(n) divides 7^k-1.

%H T. D. Noe, <a href="/A211243/b211243.txt">Table of n, a(n) for n = 1..1000</a>

%t nn = 7; Table[If[Mod[nn, p] == 0, 0, MultiplicativeOrder[nn, p]], {p, Prime[Range[100]]}]

%o (GAP) A000040:=Filtered([1..350],IsPrime);;

%o List([1..Length(A000040)],n->OrderMod(7,A000040[n])); # _Muniru A Asiru_, Feb 06 2019

%Y Cf. A014664, A062117, A082654, A211241, A211242, A211244, A211245, A002371.

%Y Row lengths of A201911. - _Michel Marcus_, Feb 04 2019

%K nonn

%O 1,3

%A _T. D. Noe_, Apr 11 2012

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Last modified February 29 04:32 EST 2020. Contains 332353 sequences. (Running on oeis4.)