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A070436
a(n) = n^2 mod 13.
3
0, 1, 4, 9, 3, 12, 10, 10, 12, 3, 9, 4, 1, 0, 1, 4, 9, 3, 12, 10, 10, 12, 3, 9, 4, 1, 0, 1, 4, 9, 3, 12, 10, 10, 12, 3, 9, 4, 1, 0, 1, 4, 9, 3, 12, 10, 10, 12, 3, 9, 4, 1, 0, 1, 4, 9, 3, 12, 10, 10, 12, 3, 9, 4, 1, 0, 1, 4, 9, 3, 12, 10, 10, 12, 3, 9, 4, 1, 0, 1, 4, 9, 3, 12, 10, 10, 12, 3, 9, 4
OFFSET
0,3
LINKS
FORMULA
G.f.: (x^12 +4*x^11 +9*x^10 +3*x^9 +12*x^8 +10*x^7 +10*x^6 +12*x^5 +3*x^4 +9*x^3 +4*x^2 +x)/(-x^13 +1). - Colin Barker, Aug 14 2012
a(n) = a(n-13). - G. C. Greubel, Mar 24 2016
MATHEMATICA
Table[Mod[n^2, 13], {n, 0, 200}] (* Vladimir Joseph Stephan Orlovsky, Apr 21 2011 *)
PROG
(PARI) a(n)=n^2%13 \\ Charles R Greathouse IV, Apr 06 2016
CROSSREFS
Sequence in context: A359259 A224953 A120869 * A259450 A219731 A217393
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, May 12 2002
STATUS
approved