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A070378

a(n) = 5^n mod 28.

1, 5, 25, 13, 9, 17, 1, 5, 25, 13, 9, 17, 1, 5, 25, 13, 9, 17, 1, 5, 25, 13, 9, 17, 1, 5, 25, 13, 9, 17, 1, 5, 25, 13, 9, 17, 1, 5, 25, 13, 9, 17, 1, 5, 25, 13, 9, 17, 1, 5, 25, 13, 9, 17, 1, 5, 25, 13, 9, 17, 1, 5, 25, 13, 9, 17, 1, 5, 25, 13, 9, 17, 1, 5, 25, 13, 9, 17, 1, 5, 25, 13, 9

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OFFSET

0,2

LINKS

Edward Jiang, Table of n, a(n) for n = 0..10000

Index entries for linear recurrences with constant coefficients, signature (1,-1,1,-1,1).

FORMULA

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

a(n) = a(n-1) - a(n-2) + a(n-3) - a(n-4) + a(n-5).

G.f.: ( -1-4*x-21*x^2+8*x^3-17*x^4 ) / ( (x-1)*(1+x+x^2)*(1-x+x^2) ). (End)

a(n) = a(n-6). - G. C. Greubel, Mar 13 2016

MATHEMATICA