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A070540 a(n) = n^4 mod 21. 1
0, 1, 16, 18, 4, 16, 15, 7, 1, 9, 4, 4, 9, 1, 7, 15, 16, 4, 18, 16, 1, 0, 1, 16, 18, 4, 16, 15, 7, 1, 9, 4, 4, 9, 1, 7, 15, 16, 4, 18, 16, 1, 0, 1, 16, 18, 4, 16, 15, 7, 1, 9, 4, 4, 9, 1, 7, 15, 16, 4, 18, 16, 1, 0, 1, 16, 18, 4, 16, 15, 7, 1, 9, 4, 4, 9, 1, 7, 15, 16, 4, 18, 16, 1, 0, 1, 16, 18 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Equivalently: n^(6*m + 4) mod 21. - G. C. Greubel, Apr 05 2016

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..1000

FORMULA

From G. C. Greubel, Apr 05 2016: (Start)

a(21*n) = 0.

a(n+21) = a(n). (End)

MATHEMATICA

PowerMod[Range[0, 100], 4, 21] (* G. C. Greubel, Apr 05 2016 *)

PROG

(Sage) [power_mod(n, 4, 21)for n in range(0, 88)] # Zerinvary Lajos, Oct 31 2009

(PARI) a(n)=n^4%21 \\ Charles R Greathouse IV, Apr 06 2016

CROSSREFS

Sequence in context: A041542 A030046 A002925 * A341271 A085096 A043675

Adjacent sequences:  A070537 A070538 A070539 * A070541 A070542 A070543

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane, May 13 2002

STATUS

approved

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Last modified July 2 10:07 EDT 2022. Contains 355004 sequences. (Running on oeis4.)