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A211243 Order of 7 mod n-th prime: least k such that prime(n) divides 7^k-1. 7
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, 100, 51, 106, 27, 14, 126, 65, 68, 69, 74, 150, 52, 162, 83, 172, 178, 12, 10, 24, 98, 99, 210, 37, 113, 228, 116, 238, 240, 125, 256, 262, 268, 135, 138, 20, 141, 292 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

T. D. Noe, Table of n, a(n) for n = 1..1000

MATHEMATICA

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

PROG

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

List([1..Length(A000040)], n->OrderMod(7, A000040[n])); # Muniru A Asiru, Feb 06 2019

CROSSREFS

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

Row lengths of A201911. - Michel Marcus, Feb 04 2019

Sequence in context: A164735 A293933 A158976 * A181626 A279432 A019127

Adjacent sequences:  A211240 A211241 A211242 * A211244 A211245 A211246

KEYWORD

nonn

AUTHOR

T. D. Noe, Apr 11 2012

STATUS

approved

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Last modified November 17 10:37 EST 2019. Contains 329225 sequences. (Running on oeis4.)