A070419 a(n) = 7^n mod 36.

1, 7, 13, 19, 25, 31, 1, 7, 13, 19, 25, 31, 1, 7, 13, 19, 25, 31, 1, 7, 13, 19, 25, 31, 1, 7, 13, 19, 25, 31, 1, 7, 13, 19, 25, 31, 1, 7, 13, 19, 25, 31, 1, 7, 13, 19, 25, 31, 1, 7, 13, 19, 25, 31, 1, 7, 13, 19, 25, 31, 1, 7, 13, 19, 25, 31, 1, 7, 13, 19, 25, 31, 1, 7, 13, 19, 25, 31

Offset

0,2

Links

G. C. Greubel, Table of n, a(n) for n = 0..1000

Index entries for linear recurrences with constant coefficients, signature (0,0,0,0,0,1). [R. J. Mathar, Apr 20 2010]

Formula

From R. J. Mathar, Apr 20 2010: (Start)

a(n) = a(n-6).

G.f.: ( -1-7*x-13*x^2-19*x^3-25*x^4-31*x^5 ) / ( (x-1)*(1+x)*(1+x+x^2)*(x^2-x+1) ). (End)

Mathematica

PowerMod[7, Range[0, 50], 36] (* G. C. Greubel, Mar 20 2016 *)

Prog

(SageMath) [power_mod(7, n, 36) for n in range(0, 78)] # Zerinvary Lajos, Nov 27 2009
(PARI) a(n) = lift(Mod(7, 36)^n); \\ Altug Alkan, Mar 20 2016
(Magma) [Modexp(7, n, 36): n in [0..100]]; // Bruno Berselli, Mar 22 2016

Crossrefs

Sequence in context: A035497 A216527 A059335 * A080199 A016921 A331425

Adjacent sequences: A070416 A070417 A070418 * A070420 A070421 A070422

Keyword

nonn,easy

Author

N. J. A. Sloane, May 12 2002

Status

approved