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9, 5, 1, 0, 5, 6, 5, 1, 6, 2, 9, 5, 1, 5, 3, 5, 7, 2, 1, 1, 6, 4, 3, 9, 3, 3, 3, 3, 7, 9, 3, 8, 2, 1, 4, 3, 4, 0, 5, 6, 9, 8, 6, 3, 4, 1, 2, 5, 7, 5, 0, 2, 2, 2, 4, 4, 7, 3, 0, 5, 6, 4, 4, 4, 3, 0, 1, 5, 3, 1, 7, 0, 0, 8, 5, 1, 9, 3, 5, 0, 1, 7, 1, 8, 7, 9, 2, 8, 1, 0, 9, 7, 0, 8, 1, 1, 3, 8, 1
(list;
constant;
graph;
refs;
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internal format)
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OFFSET
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0,1
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COMMENTS
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Circumradius of pentagonal pyramid (Johnson solid 2) with edge 1. - Vladimir Joseph Stephan Orlovsky, Jul 19 2010
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LINKS
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Table of n, a(n) for n=0..98.
Anonymous, Exact trigonometric constants, Wikipedia
Wolfram Alpha, Johnson solid 2
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FORMULA
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Equals sqrt((5+sqrt(5))/8) = cos(Pi/10). - Zak Seidov, Nov 18 2006
Equals 2F1(13/20,7/20;1/2;3/4) / 2. - R. J. Mathar, Oct 27 2008
Equals the real part of i^(1/5). - Stanislav Sykora, Apr 25 2012
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EXAMPLE
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0.95105651629515357211643933337938214340569863412575022244730564443...
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MATHEMATICA
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RealDigits[Sqrt[(5 + Sqrt[5])/8], 10, 111] (* Robert G. Wilson v *)
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CROSSREFS
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Cf. A001622, A010527, A102208, A179290, A179292, A179294, A179449, A179450, A179451, A179452, A179552, A179553.
Sequence in context: A199869 A197378 A201395 * A049256 A019982 A198421
Adjacent sequences: A019878 A019879 A019880 * A019882 A019883 A019884
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KEYWORD
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nonn,cons
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AUTHOR
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N. J. A. Sloane.
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STATUS
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approved
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