A377696 Decimal expansion of the circumradius of a truncated dodecahedron with unit edge length.

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

Offset: 1

Author

Paolo Xausa, Nov 04 2024

Keywords

• nonn
• cons
• easy

Examples

			2.9694490158633984670421666956925979636007477003...
		

Links

• Eric Weisstein's World of Mathematics, Truncated Dodecahedron.
• Wikipedia, Truncated dodecahedron.

Crossrefs

Cf. A377694 (surface area), A377695 (volume), A377697 (midradius), A377698 (Dehn invariant, negated).

Cf. A179296 (analogous for a regular dodecahedron).

Cf. A002163.

Programs

Mathematica

First[RealDigits[Sqrt[74 + 30*Sqrt[5]]/4, 10, 100]] (* or *)
First[RealDigits[PolyhedronData["TruncatedDodecahedron", "Circumradius"], 10, 100]]

Formula

Equals sqrt(74 + 30*sqrt(5))/4 = sqrt(74 + 30*A002163)/4.