login
A195722
Decimal expansion of arccos(-sqrt(1/6)).
2
1, 9, 9, 1, 3, 3, 0, 6, 6, 2, 0, 7, 8, 8, 6, 1, 7, 4, 7, 1, 1, 9, 5, 8, 4, 2, 0, 7, 5, 5, 2, 9, 6, 6, 8, 1, 5, 4, 4, 9, 6, 2, 4, 0, 9, 2, 5, 0, 7, 4, 7, 2, 5, 2, 0, 3, 7, 6, 7, 3, 3, 6, 9, 8, 4, 9, 9, 9, 5, 2, 8, 5, 4, 8, 8, 1, 2, 7, 3, 1, 7, 9, 5, 7, 3, 2, 8, 4, 4, 1, 5, 0, 9, 6, 8, 5, 1, 0, 5, 0, 8, 8, 2, 5, 6, 3, 3, 8, 5, 8, 7, 4, 6, 5, 6, 4, 1, 1, 3, 4, 8, 7, 5, 8, 7, 0, 0, 5, 1, 1
OFFSET
1,2
LINKS
FORMULA
Equals Pi - arcsin(sqrt(5/6)) = Pi - arctan(sqrt(5)). - Amiram Eldar, Jul 06 2023
EXAMPLE
arccos(-sqrt(1/6)) = 1.99133066207...
MATHEMATICA
RealDigits[ArcCos[-Sqrt[(1/6)]], 10, 120][[1]] (* Harvey P. Dale, May 30 2014 *)
PROG
(PARI) acos(-sqrt(1/6)) \\ G. C. Greubel, Aug 20 2018
(Magma) SetDefaultRealField(RealField(100)); Arccos(-Sqrt(1/6)); // G. C. Greubel, Aug 20 2018
CROSSREFS
Cf. A195720.
Sequence in context: A351722 A334425 A280554 * A133627 A268918 A144982
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Sep 23 2011
EXTENSIONS
Corrected and extended by Harvey P. Dale, May 30 2014
STATUS
approved