A070568 a(n) = n^4 mod 25.

0, 1, 16, 6, 6, 0, 21, 1, 21, 11, 0, 16, 11, 11, 16, 0, 11, 21, 1, 21, 0, 6, 6, 16, 1, 0, 1, 16, 6, 6, 0, 21, 1, 21, 11, 0, 16, 11, 11, 16, 0, 11, 21, 1, 21, 0, 6, 6, 16, 1, 0, 1, 16, 6, 6, 0, 21, 1, 21, 11, 0, 16, 11, 11, 16, 0, 11, 21, 1, 21, 0, 6, 6, 16, 1, 0, 1, 16, 6, 6, 0, 21, 1, 21

Offset

0,3

Comments

Periodic with period length equal to 25. - Harvey P. Dale, May 11 2020

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, 0, 0, 0, 0, 1).

Mathematica

PowerMod[Range[0, 90], 4, 25] (* or *) PadRight[{}, 120, {0, 1, 16, 6, 6, 0, 21, 1, 21, 11, 0, 16, 11, 11, 16, 0, 11, 21, 1, 21, 0, 6, 6, 16, 1}] (* Harvey P. Dale, May 11 2020 *)

Prog

(Sage) [power_mod(n, 4, 25)for n in range(0, 84)] # - Zerinvary Lajos, Oct 31 2009
(PARI) a(n)=n^4%25 \\ Charles R Greathouse IV, Apr 06 2016

Crossrefs

Sequence in context: A040244 A084527 A084517 * A161884 A166210 A141078

Adjacent sequences: A070565 A070566 A070567 * A070569 A070570 A070571

Keyword

nonn,easy

Author

N. J. A. Sloane, May 13 2002

Status

approved