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A070419 a(n) = 7^n mod 36. 1
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 (list; graph; refs; listen; history; text; internal format)
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

(Sage) [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

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Last modified June 15 11:06 EDT 2021. Contains 345048 sequences. (Running on oeis4.)