OFFSET
1,1
LINKS
G. C. Greubel, Table of n, a(n) for n = 1..10000
FORMULA
Equals Pi - arcsin(sqrt(1/6)) = Pi - arctan(sqrt(1/5)). - Amiram Eldar, Jul 10 2023
EXAMPLE
arccos(-sqrt(5/6)) = 2.72105831830582...
MATHEMATICA
r = Sqrt[5/6];
N[ArcCos[-r], 100]
RealDigits[%]
PROG
(PARI) acos(-sqrt(5/6)) \\ G. C. Greubel, Aug 20 2018
(Magma) SetDefaultRealField(RealField(100)); Arccos(-Sqrt(5/6)); // G. C. Greubel, Aug 20 2018
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Sep 23 2011
STATUS
approved