Annual appeal: Please make a donation to keep the OEIS running! Over 6000 articles have referenced us, often saying "we discovered this result with the help of the OEIS". Other ways to donate

1,1

Dihedral angle between mixed type faces of the truncated octahedron. - R. J. Mathar, Mar 24 2012

G. C. Greubel, Table of n, a(n) for n = 1..5000

Wikipedia, Truncated Octahedron

arccos(-1/sqrt(3)) = 2.1862760354...

(See A195695.)

RealDigits[ArcCos[-1/Sqrt[3]], 10, 50][[1]] (* G. C. Greubel, Nov 18 2017 *)

(PARI) acos(-1/sqrt(3)) \\ G. C. Greubel, Nov 18 2017

(MAGMA) [Arccos(-1/Sqrt(3))]; // G. C. Greubel, Nov 18 2017

Cf. A195695.

Sequence in context: A108084 A108085 A272983 * A193908 A193904 A154897

Adjacent sequences: A195695 A195696 A195697 * A195699 A195700 A195701

nonn,cons

Clark Kimberling, Sep 23 2011

approved