OFFSET
0,3
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..1000
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, 0, 0, 0, 0, 1).
FORMULA
G.f.: (x +4*x^2 +9*x^3 +16*x^4 +25*x^5 +10*x^6 +23*x^7 +12*x^8 +3*x^9 +22*x^10 +17*x^11 +14*x^12 +13*x^13 +14*x^14 +17*x^15 + 22*x^16 + 3*x^17 +12*x^18 +23*x^19 +10*x^20 +25*x^21 +16*x^22 +9*x^23 +4*x^24 +x^25)/(1-x^26). - Vincenzo Librandi, Dec 16 2014
a(n) = a(n-26). - G. C. Greubel, Mar 24 2016
MAPLE
MATHEMATICA
Table[Mod[n^2, 26], {n, 0, 200}] (* Vladimir Joseph Stephan Orlovsky, Apr 23 2011 *)
PowerMod[Range[0, 80], 2, 26] (* Harvey P. Dale, Dec 15 2014 *)
PROG
(PARI) a(n)=n^2%26 \\ Charles R Greathouse IV, Apr 06 2016
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, May 12 2002
STATUS
approved