OFFSET
1,1
LINKS
Stanislav Sykora, Table of n, a(n) for n = 1..2000
Wikipedia, Platonic solid.
FORMULA
Equals 2*arctan(phi^2) = 2*arctan(A001622^2) = 2*arctan((3+sqrt(5))/2).
EXAMPLE
2.41186499736282687500784672346618218880066348532739213...
MATHEMATICA
RealDigits[2 * ArcTan[GoldenRatio^2], 10, 120][[1]] (* Amiram Eldar, May 17 2023 *)
PROG
(PARI) 2*atan((3+sqrt(5))/2)
CROSSREFS
KEYWORD
AUTHOR
Stanislav Sykora, Jan 23 2014
STATUS
approved