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A195726
Decimal expansion of arccos(-sqrt(5/6)).
2
2, 7, 2, 1, 0, 5, 8, 3, 1, 8, 3, 0, 5, 8, 2, 8, 1, 1, 0, 5, 7, 4, 3, 8, 0, 8, 6, 7, 3, 6, 6, 2, 8, 7, 5, 1, 0, 8, 4, 6, 1, 3, 0, 0, 0, 6, 5, 5, 5, 1, 8, 6, 2, 1, 1, 0, 8, 5, 6, 8, 3, 1, 8, 9, 9, 6, 1, 7, 7, 1, 7, 5, 4, 5, 4, 8, 0, 4, 0, 3, 1, 8, 3, 6, 8, 7, 6, 7, 8, 2, 2, 9, 1, 6, 3, 2, 4, 5, 5, 1
OFFSET
1,1
LINKS
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
Cf. A195725.
Sequence in context: A139339 A090986 A245221 * A095194 A254251 A095711
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Sep 23 2011
STATUS
approved