A195726 Decimal expansion of arccos(-sqrt(5/6)).

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

Author

Clark Kimberling, Sep 23 2011

Keywords

• nonn
• cons

Examples

			arccos(-sqrt(5/6)) = 2.72105831830582...
		

Links

• G. C. Greubel, Table of n, a(n) for n = 1..10000
• Index entries for transcendental numbers

Crossrefs

Cf. A195725.

Programs

Magma

SetDefaultRealField(RealField(100)); Arccos(-Sqrt(5/6)); // G. C. Greubel, Aug 20 2018

Mathematica

r = Sqrt[5/6];
N[ArcCos[-r], 100]
RealDigits[%]

PARI

acos(-sqrt(5/6)) \\ G. C. Greubel, Aug 20 2018

Formula

Equals Pi - arcsin(sqrt(1/6)) = Pi - arctan(sqrt(1/5)). - Amiram Eldar, Jul 10 2023