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A070450
a(n) = n^2 mod 28.
6
0, 1, 4, 9, 16, 25, 8, 21, 8, 25, 16, 9, 4, 1, 0, 1, 4, 9, 16, 25, 8, 21, 8, 25, 16, 9, 4, 1, 0, 1, 4, 9, 16, 25, 8, 21, 8, 25, 16, 9, 4, 1, 0, 1, 4, 9, 16, 25, 8, 21, 8, 25, 16, 9, 4, 1, 0, 1, 4, 9, 16, 25, 8, 21, 8, 25, 16, 9, 4, 1, 0, 1, 4, 9, 16, 25, 8, 21, 8, 25, 16, 9, 4, 1, 0, 1, 4, 9, 16
OFFSET
0,3
COMMENTS
Periodic, with period = 14. - Harvey P. Dale, Jul 20 2021
LINKS
Index entries for linear recurrences with constant coefficients, signature (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1).
FORMULA
a(n) = a(n-28). - G. C. Greubel, Mar 24 2016
MATHEMATICA
Table[Mod[n^2, 28], {n, 0, 200}] (* Vladimir Joseph Stephan Orlovsky, Apr 27 2011 *)
PowerMod[Range[0, 100], 2, 28] (* or *) PadRight[{}, 100, {0, 1, 4, 9, 16, 25, 8, 21, 8, 25, 16, 9, 4, 1}] (* Harvey P. Dale, Jul 20 2021 *)
PROG
(PARI) a(n)=n^2%28 \\ Charles R Greathouse IV, Apr 06 2016
CROSSREFS
Sequence in context: A304233 A357556 A070451 * A070449 A357408 A070448
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, May 12 2002
STATUS
approved