OFFSET
0,1
COMMENTS
This is the middle angle (in radians) of the unique right triangle whose angles are in geometric progression; common ratio is phi and the angles are (Pi/(2*phi^2), Pi/(2*phi), Pi/2) in radians, corresponding to approximately (34.377, 55.623, 90) in degrees.
EXAMPLE
0.970805519362733288673432814981347978817334946923024149753694108...
MAPLE
evalf(Pi/(1+sqrt(5)), 150);
MATHEMATICA
RealDigits[Pi/(2*GoldenRatio), 10, 100][[1]] (* Amiram Eldar, Feb 09 2021 *)
PROG
(PARI) Pi/(1+sqrt(5)) \\ Michel Marcus, Feb 09 2021
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Bernard Schott, Feb 09 2021
STATUS
approved