A195706 Decimal expansion of arccos(-sqrt(3/8)).

2, 2, 2, 9, 8, 5, 4, 3, 6, 2, 6, 2, 1, 3, 0, 5, 6, 0, 2, 1, 0, 4, 1, 5, 3, 8, 1, 8, 9, 6, 2, 7, 7, 1, 6, 7, 7, 0, 2, 1, 7, 8, 0, 1, 8, 2, 9, 8, 2, 9, 1, 0, 2, 6, 8, 9, 1, 4, 2, 4, 6, 5, 5, 4, 8, 6, 0, 5, 7, 4, 7, 7, 4, 4, 7, 4, 1, 4, 6, 1, 3, 7, 7, 6, 5, 1, 5, 1, 7, 4, 7, 8, 9, 2, 5, 8, 0, 5, 0, 0

Offset: 1

Author

Clark Kimberling, Sep 23 2011

Keywords

• nonn
• cons

Examples

			arccos(-sqrt(3/8)) = 2.2298543626213056...
		

Links

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

Crossrefs

Cf. A195700.

Programs

Magma

SetDefaultRealField(RealField(100)); Arccos(-Sqrt(3/8)); // G. C. Greubel, Aug 19 2018

Mathematica

r = Sqrt[3/8];
N[ArcCos[-r], 100]
RealDigits[%]

PARI

acos(-sqrt(3/8)) \\ G. C. Greubel, Aug 19 2018

Formula

Equals Pi - arcsin(sqrt(5/2)/2) = Pi - arctan(sqrt(5/3)). - Amiram Eldar, Jul 09 2023