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A167425
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a(n) = 2^n mod 26.
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0
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1, 2, 4, 8, 16, 6, 12, 24, 22, 18, 10, 20, 14, 2, 4, 8, 16, 6, 12, 24, 22, 18, 10, 20, 14, 2, 4, 8, 16, 6, 12, 24, 22, 18, 10, 20, 14, 2, 4, 8, 16, 6, 12, 24, 22, 18, 10, 20, 14, 2, 4, 8, 16, 6, 12, 24, 22, 18, 10, 20, 14, 2, 4, 8, 16, 6, 12, 24, 22, 18, 10, 20, 14, 2, 4, 8, 16, 6, 12, 24
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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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G.f.: (x+2*x^2+4*x^3+8*x^4-10*x^5+7*x^6+13*x^7+1)/((1-x)*(x^2+1)*(x^4-x^2+1)).
a(n) = +a(n-1) -a(n-6) +a(n-7) for n>7. (End)
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MATHEMATICA
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PowerMod[2, Range[0, 100], 26] (* or *) PadRight[{1}, 100, {14, 2, 4, 8, 16, 6, 12, 24, 22, 18, 10, 20}] (* Harvey P. Dale, Aug 02 2013 *)
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PROG
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(Sage) [power_mod(2, n, 26)for n in range(0, 87)] #
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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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