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 range(0, 101)] # Zerinvary Lajos, Nov 06 2009
(Sage) [power_mod(n, 6, 5)for n in range(0, 101)] # Zerinvary Lajos, Nov 06 2009
(PARI) a(n)=n^2%5 \\ Charles R Greathouse IV, Sep 28 2015
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, May 12 2002
STATUS
approved