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A130815
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Period 6: repeat [1, 5, 4, -1, -5, -4].
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5
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1, 5, 4, -1, -5, -4, 1, 5, 4, -1, -5, -4, 1, 5, 4, -1, -5, -4, 1, 5, 4, -1, -5, -4, 1, 5, 4, -1, -5, -4, 1, 5, 4, -1, -5, -4, 1, 5, 4, -1, -5, -4, 1, 5, 4, -1, -5, -4, 1, 5, 4, -1, -5, -4, 1, 5, 4, -1, -5, -4, 1, 5, 4, -1, -5, -4, 1, 5, 4, -1, -5, -4
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OFFSET
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0,2
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COMMENTS
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Continued fraction expansion of (5+sqrt(11))/7 = 1.1880892557650... - R. J. Mathar, Mar 08 2012
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LINKS
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FORMULA
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Binomial transform of 1, 4, -5.
G.f.: (1+4x)/(1-x+x^2).
a(n) = a(n-1) - a(n-2) for n>1.
a(n) = cos(n*Pi/3) + 3*sqrt(3)*sin(n*Pi/3). (End)
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MATHEMATICA
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PadRight[{}, 120, {1, 5, 4, -1, -5, -4}] (* Harvey P. Dale, Jul 12 2020 *)
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PROG
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(Magma) &cat[[1, 5, 4, -1, -5, -4]: n in [0..20]]; // Wesley Ivan Hurt, Jun 17 2016
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CROSSREFS
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KEYWORD
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sign,easy,less
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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