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 A070444 a(n) = n^2 mod 22. 2
 0, 1, 4, 9, 16, 3, 14, 5, 20, 15, 12, 11, 12, 15, 20, 5, 14, 3, 16, 9, 4, 1, 0, 1, 4, 9, 16, 3, 14, 5, 20, 15, 12, 11, 12, 15, 20, 5, 14, 3, 16, 9, 4, 1, 0, 1, 4, 9, 16, 3, 14, 5, 20, 15, 12, 11, 12, 15, 20, 5, 14, 3, 16, 9, 4, 1, 0, 1, 4, 9, 16, 3, 14, 5, 20, 15, 12, 11, 12, 15, 20, 5 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..3000 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, 1). FORMULA From R. J. Mathar, Jul 27 2015: (Start) a(n) = a(n-22). G.f.: -x*(1 +4*x +9*x^2 +16*x^3 +3*x^4 +14*x^5 +5*x^6 +20*x^7 +15*x^8 +12*x^9 +11*x^10 +12*x^11 +15*x^12 +20*x^13 +5*x^14 +14*x^15 +3*x^16 +16*x^17 +9*x^18 +4*x^19+x^20) ) / ( (x-1) *(1+x^10+x^9+x^8+x^7+x^6+x^5+x^4+x^3+x^2+x) *(1+x) *(1-x+x^2-x^3+x^4-x^5+x^6-x^7+x^8-x^9+x^10) ). (End) MATHEMATICA Table[Mod[n^2, 22], {n, 0, 200}] (* Vladimir Joseph Stephan Orlovsky, Apr 23 2011 *) PROG (Maxima) makelist(power_mod (n, 2, 22), n, 0, 81); \\ Bruno Berselli, May 25 2011 (MAGMA) [n^2 mod (22): n in [0..80]]; // Vincenzo Librandi, May 26 2011 (PARI) a(n)=n^2%22 \\ Charles R Greathouse IV, Apr 06 2016 CROSSREFS Sequence in context: A070446 A258682 A070445 * A120866 A070443 A279403 Adjacent sequences:  A070441 A070442 A070443 * A070445 A070446 A070447 KEYWORD nonn,easy AUTHOR N. J. A. Sloane, May 12 2002 STATUS approved

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Last modified April 21 17:36 EDT 2021. Contains 343156 sequences. (Running on oeis4.)