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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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Last modified December 12 21:50 EST 2017. Contains 295954 sequences.