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A070568
a(n) = n^4 mod 25.
0
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
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
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, May 13 2002
STATUS
approved