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A070372

a(n) = 5^n mod 18.

1, 5, 7, 17, 13, 11, 1, 5, 7, 17, 13, 11, 1, 5, 7, 17, 13, 11, 1, 5, 7, 17, 13, 11, 1, 5, 7, 17, 13, 11, 1, 5, 7, 17, 13, 11, 1, 5, 7, 17, 13, 11, 1, 5, 7, 17, 13, 11, 1, 5, 7, 17, 13, 11, 1, 5, 7, 17, 13, 11, 1, 5, 7, 17, 13, 11, 1, 5, 7, 17, 13, 11, 1, 5, 7, 17, 13, 11, 1, 5, 7, 17, 13

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OFFSET

0,2

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..999

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

FORMULA

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

a(n) = a(n-1) - a(n-3) + a(n-4).

G.f.: ( -1-4*x-2*x^2-11*x^3 ) / ( (x-1)*(1+x)*(x^2-x+1) ). (End)

a(n) = a(n-6). - G. C. Greubel, Mar 05 2016

MATHEMATICA