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 A195698 Decimal expansion of arccos(-sqrt(1/3)). 2
 2, 1, 8, 6, 2, 7, 6, 0, 3, 5, 4, 6, 5, 2, 8, 3, 9, 6, 0, 2, 9, 8, 7, 8, 6, 2, 8, 0, 7, 6, 3, 7, 4, 5, 1, 2, 9, 9, 5, 3, 7, 5, 4, 7, 0, 4, 3, 6, 5, 1, 0, 0, 3, 3, 0, 0, 1, 5, 2, 4, 6, 4, 6, 2, 9, 8, 5, 9, 0, 4, 3, 6, 0, 3, 8, 2, 2, 3, 2, 5, 4, 3, 2, 4, 0, 6, 4, 3, 2, 2, 2, 7, 5, 6, 4, 8, 8, 9, 9, 4 (list; constant; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Dihedral angle between mixed type faces of the truncated octahedron. - R. J. Mathar, Mar 24 2012 LINKS G. C. Greubel, Table of n, a(n) for n = 1..5000 Wikipedia, Truncated Octahedron EXAMPLE arccos(-1/sqrt(3)) = 2.1862760354... MATHEMATICA (See A195695.) RealDigits[ArcCos[-1/Sqrt[3]], 10, 50][[1]] (* G. C. Greubel, Nov 18 2017 *) PROG (PARI) acos(-1/sqrt(3)) \\ G. C. Greubel, Nov 18 2017 (MAGMA) [Arccos(-1/Sqrt(3))]; // G. C. Greubel, Nov 18 2017 CROSSREFS Cf. A195695. Sequence in context: A108084 A108085 A272983 * A193908 A193904 A154897 Adjacent sequences:  A195695 A195696 A195697 * A195699 A195700 A195701 KEYWORD nonn,cons AUTHOR Clark Kimberling, Sep 23 2011 STATUS approved

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