A386742 Decimal expansion of the surface area of a hebesphenomegacorona with unit edges.

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

Offset: 2

Author

Paolo Xausa, Aug 01 2025

Keywords

• nonn
• cons
• easy

Comments

The hebesphenomegacorona is Johnson solid J_89.

Examples

			10.794228634059947820873508536776425651242623642...
		

Links

• Paolo Xausa, Table of n, a(n) for n = 2..10000
• Wikipedia, Hebesphenomegacorona.

Crossrefs

Cf. A386741 (volume).

Cf. A002194.

Programs

Mathematica

First[RealDigits[3 + 9/2*Sqrt[3], 10, 100]] (* or *)
First[RealDigits[PolyhedronData["J89", "SurfaceArea"], 10, 100]]

Formula

Equals 3 + (9/2)*sqrt(3) = 3 + (9/2)*A002194.