OFFSET
1,2
COMMENTS
The angle is in radians.
LINKS
Stanislav Sykora, Table of n, a(n) for n = 1..2000
Wikipedia, Dodecahedron (use the point coordinates to derive the formula).
FORMULA
EXAMPLE
1.20593249868141343750392336173309109440033174266369606513299755...
MATHEMATICA
RealDigits[ArcCos[1/(GoldenRatio Sqrt[3])], 10, 120][[1]] (* Harvey P. Dale, May 17 2016 *)
PROG
(PARI) acos(2/(1+sqrt(5))/sqrt(3))
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Stanislav Sykora, Jun 06 2014
STATUS
approved