A167129 - OEIS

A167129

n^7 mod 21.

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,3

COMMENTS

Equivalently: n^(6*m+7) mod 21. - G. C. Greubel, Jun 04 2016

LINKS

Table of n, a(n) for n=0..83.

Index entries for linear recurrences with constant coefficients, signature (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1).

FORMULA

a(n) = a(n-21). - R. J. Mathar, Sep 30 2013

MATHEMATICA

PowerMod[Range[0, 90], 7, 21] (* or *) PadRight[{}, 90, Range[0, 20]] (* Harvey P. Dale, Apr 21 2012 *)