A386695 Decimal expansion of the volume of a snub disphenoid with unit edges.

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

Offset: 0

Author

Paolo Xausa, Jul 31 2025

Keywords

• nonn
• cons
• easy

Comments

The snub disphenoid is Johnson solid J_84.

Examples

			0.85949364619130053155540963697973639270749722...
		

Links

• Paolo Xausa, Table of n, a(n) for n = 0..10000
• Wikipedia, Snub disphenoid.

Crossrefs

Cf. A010482 (surface area).

Cf. A386696.

Programs

Mathematica

First[RealDigits[Root[5832*#^6 - 1377*#^4 - 2160*#^2 - 4 &, 2], 10, 100]] (* or *)
First[RealDigits[PolyhedronData["J84", "Volume"], 10, 100]]

Formula

Equals the largest real root of 5832*x^6 - 1377*x^4 - 2160*x^2 - 4.