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A070376
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a(n) = 5^n mod 26.
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1
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1, 5, 25, 21, 1, 5, 25, 21, 1, 5, 25, 21, 1, 5, 25, 21, 1, 5, 25, 21, 1, 5, 25, 21, 1, 5, 25, 21, 1, 5, 25, 21, 1, 5, 25, 21, 1, 5, 25, 21, 1, 5, 25, 21, 1, 5, 25, 21, 1, 5, 25, 21, 1, 5, 25, 21, 1, 5, 25, 21, 1, 5, 25, 21, 1, 5, 25, 21, 1, 5, 25, 21, 1, 5, 25, 21, 1, 5, 25, 21, 1, 5, 25, 21
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) = a(n-1) - a(n-2) + a(n-3).
G.f.: ( -1-4*x-21*x^2 ) / ( (x-1)*(1+x^2) ). (End)
a(n) = 13 - 2*((3+2*i)*(-i)^n + (3-2*i)*i^n), where i = sqrt(-1). - Bruno Berselli, Feb 07 2011
a(n) = a(n-4).
E.g.f.: 13*exp(x) - 12*cos(x) - 8*sin(x). (End)
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MAPLE
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MATHEMATICA
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PROG
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(Sage) [power_mod(5, n, 26) for n in range(0, 84)] # Zerinvary Lajos, Nov 26 2009
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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