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A070449 a(n) = n^2 mod 27. 2
0, 1, 4, 9, 16, 25, 9, 22, 10, 0, 19, 13, 9, 7, 7, 9, 13, 19, 0, 10, 22, 9, 25, 16, 9, 4, 1, 0, 1, 4, 9, 16, 25, 9, 22, 10, 0, 19, 13, 9, 7, 7, 9, 13, 19, 0, 10, 22, 9, 25, 16, 9, 4, 1, 0, 1, 4, 9, 16, 25, 9, 22, 10, 0, 19, 13, 9, 7, 7, 9, 13, 19, 0, 10, 22, 9, 25, 16, 9, 4, 1, 0, 1, 4, 9, 16 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
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, 0, 1).
FORMULA
a(n) = a(n-27). - G. C. Greubel, Mar 24 2016
G.f.:(x + 4*x^2 + 9*x^3 + 16*x^4 + 25*x^5 + 9*x^6 + 22*x^7 + 10*x^8 + 19*x^10 + 13*x^11 + 9*x^12 + 7*x^13 + 7*x^14 + 9*x^15 + 13*x^16 + 19*x^17 + 10*x^19 + 22*x^20 + 9*x^21 + 25*x^22 + 16*x^23 + 9*x^24 + 4*x^25 + x^26)/(1 - x^27). - Vincenzo Librandi, Mar 25 2016
MATHEMATICA
Table[Mod[n^2, 27], {n, 0, 200}] (* Vladimir Joseph Stephan Orlovsky, Apr 23 2011 *)
PowerMod[Range[0, 100], 2, 27] (* or *) PadRight[{}, 100, {0, 1, 4, 9, 16, 25, 9, 22, 10, 0, 19, 13, 9, 7, 7, 9, 13, 19, 0, 10, 22, 9, 25, 16, 9, 4, 1}] (* Harvey P. Dale, Dec 17 2023 *)
PROG
(PARI) a(n)=n^2%27 \\ Charles R Greathouse IV, Apr 06 2016
CROSSREFS
Sequence in context: A357556 A070451 A070450 * A357408 A070448 A081403
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, May 12 2002
STATUS
approved

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)