OFFSET
1,1
LINKS
G. C. Greubel, Table of n, a(n) for n = 1..10000
FORMULA
Equals Pi - arcsin(sqrt(5/2)/2) = Pi - arctan(sqrt(5/3)). - Amiram Eldar, Jul 09 2023
EXAMPLE
arccos(-sqrt(3/8)) = 2.2298543626213056...
MATHEMATICA
r = Sqrt[3/8];
N[ArcCos[-r], 100]
RealDigits[%]
PROG
(PARI) acos(-sqrt(3/8)) \\ G. C. Greubel, Aug 19 2018
(Magma) SetDefaultRealField(RealField(100)); Arccos(-Sqrt(3/8)); // G. C. Greubel, Aug 19 2018
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Sep 23 2011
STATUS
approved