A377274 Decimal expansion of the surface area of a truncated tetrahedron with unit edge length.

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

Offset: 2

Author

Paolo Xausa, Oct 23 2024

Keywords

• nonn
• cons
• easy

Examples

			12.12435565298214105469212439054110656859963677667...
		

Links

• Eric Weisstein's World of Mathematics, Truncated Tetrahedron.
• Wikipedia, Truncated tetrahedron.

Crossrefs

Cf. A377275 (volume), A377276 (circumradius), A093577 (midradius), A377277 (Dehn invariant).

Cf. A002194 (analogous for a regular tetrahedron).

Programs

Mathematica

First[RealDigits[7*Sqrt[3], 10, 100]] (* or *)
First[RealDigits[PolyhedronData["TruncatedTetrahedron", "SurfaceArea"], 10, 100]]

Formula

Equals 7*sqrt(3) = 7*A002194.