A375392 Decimal expansion of the hyperbolic volume of the link complement of the Borromean rings.

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

Offset: 1

Author

Luc Ta, Aug 21 2024

Keywords

• nonn
• cons
• easy

Examples

			7.32772475341775212043682811945907288619319499425337707...
		

Links

• Luc Ta, Table of n, a(n) for n = 1..10000
• William P. Thurston, The Geometry and Topology of Three-Manifolds: With a Preface by Steven P. Kerckhoff, American Mathematical Society (2022): p. 165, Example.
• Index entries for sequences related to knots

Crossrefs

Cf. A006752, A247685, A091518, A282824.

Programs

Mathematica

RealDigits[N[8 * Catalan, 100]][[1]]

Formula

Equals 8*A006752 = 2*A247685.

Equals -16*Integral_{x=0..Pi/4} log|2*sin(x)| dx.

Equals 2*hyperbolic volume of the link complement of the Whitehead link.