OFFSET
0,3
LINKS
Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,0,0,1).
FORMULA
Periodic with period 7.
G.f.: -x*(1+x)*(x^4 + 3*x^3 - x^2 + 3*x + 1) / ( (x-1)*(1 + x + x^2 + x^3 + x^4 + x^5 + x^6) ). - R. J. Mathar, Feb 24 2011
MATHEMATICA
Table[Mod[n^2, 7], {n, 0, 200}] (* Vladimir Joseph Stephan Orlovsky, Apr 21 2011 *)
LinearRecurrence[{0, 0, 0, 0, 0, 0, 1}, {0, 1, 4, 2, 2, 4, 1}, 105] (* Ray Chandler, Aug 26 2015 *)
PowerMod[Range[0, 120], 2, 7] (* or *) PadRight[{}, 120, {0, 1, 4, 2, 2, 4, 1}] (* Harvey P. Dale, Sep 01 2017 *)
PROG
(PARI) a(n)=n^2%7 \\ Charles R Greathouse IV, Jun 11 2015
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Stuart M. Ellerstein (ellerstein(AT)aol.com), Apr 01 2000
EXTENSIONS
More terms from James A. Sellers, Apr 08 2000
STATUS
approved