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A070422

a(n) = 7^n mod 39.

1, 7, 10, 31, 22, 37, 25, 19, 16, 34, 4, 28, 1, 7, 10, 31, 22, 37, 25, 19, 16, 34, 4, 28, 1, 7, 10, 31, 22, 37, 25, 19, 16, 34, 4, 28, 1, 7, 10, 31, 22, 37, 25, 19, 16, 34, 4, 28, 1, 7, 10, 31, 22, 37, 25, 19, 16, 34, 4, 28, 1, 7, 10, 31, 22, 37, 25, 19, 16, 34, 4, 28, 1, 7, 10, 31

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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 (0,1,0,-1,0,1,0,-1,0,1).

FORMULA

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

a(n) = a(n-2) - a(n-4) + a(n-6) - a(n-8) + a(n-10).

G.f.: ( -1-7*x-9*x^2-24*x^3-13*x^4-13*x^5-12*x^6-6*x^7-4*x^8-28*x^9 ) / ( (x-1)*(1+x)*(1+x+x^2)*(x^2-x+1)*(1-x^2+x^4) ). (End)

a(n) = a(n-12). - G. C. Greubel, Mar 22 2016

MATHEMATICA