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 A070430 a(n) = n^2 mod 5. 11
 0, 1, 4, 4, 1, 0, 1, 4, 4, 1, 0, 1, 4, 4, 1, 0, 1, 4, 4, 1, 0, 1, 4, 4, 1, 0, 1, 4, 4, 1, 0, 1, 4, 4, 1, 0, 1, 4, 4, 1, 0, 1, 4, 4, 1, 0, 1, 4, 4, 1, 0, 1, 4, 4, 1, 0, 1, 4, 4, 1, 0, 1, 4, 4, 1, 0, 1, 4, 4, 1, 0, 1, 4, 4, 1, 0, 1, 4, 4, 1, 0, 1, 4, 4, 1, 0, 1, 4, 4, 1, 0, 1, 4, 4, 1, 0, 1, 4, 4, 1, 0 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Equivalently n^6 mod 5. - Zerinvary Lajos, Nov 06 2009 LINKS Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,1). FORMULA From R. J. Mathar, Apr 20 2010: (Start) a(n) = a(n-5). G.f.: -x*(1+x)*(x^2+3*x+1) / ( (x-1)*(1+x+x^2+x^3+x^4) ). (End) MATHEMATICA Table[Mod[n^2, 5], {n, 0, 200}] (* Vladimir Joseph Stephan Orlovsky, Apr 21 2011 *) PowerMod[Range[0, 200], 2, 5] (* G. C. Greubel, Mar 22 2016 *) PROG (Sage) [power_mod(n, 2, 5)for n in xrange(0, 101)] # Zerinvary Lajos, Nov 06 2009 (Sage) [power_mod(n, 6, 5)for n in xrange(0, 101)] # Zerinvary Lajos, Nov 06 2009 (PARI) a(n)=n^2%5 \\ Charles R Greathouse IV, Sep 28 2015 CROSSREFS Cf. A053879, A070431, A070432. Sequence in context: A260043 A185057 A048152 * A163353 A164612 A309748 Adjacent sequences:  A070427 A070428 A070429 * A070431 A070432 A070433 KEYWORD nonn,easy AUTHOR N. J. A. Sloane, May 12 2002 STATUS approved

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Last modified September 16 12:41 EDT 2019. Contains 327113 sequences. (Running on oeis4.)