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.
FORMULA
Equals Pi - arcsin(sqrt(2/3)) = Pi - arctan(sqrt(2)). - Amiram Eldar, Jul 08 2023
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
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Sep 23 2011
STATUS
approved