A377275 Decimal expansion of the volume of a truncated tetrahedron with unit edge length.

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

Offset

1,1

Links

Table of n, a(n) for n=1..90.

Eric Weisstein's World of Mathematics, Truncated Tetrahedron.

Wikipedia, Truncated tetrahedron.

Formula

Equals (23/12)*sqrt(2) = (23/12)*A002193.

Example

2.7105759945484321768699033880685879839252044278...

Mathematica

First[RealDigits[23/12*Sqrt[2], 10, 100]] (* or *)
First[RealDigits[PolyhedronData["TruncatedTetrahedron", "Volume"], 10, 100]]

Crossrefs

Cf. A377274 (surface area), A377276 (circumradius), A093577 (midradius), A377277 (Dehn invariant).

Cf. A020829 (analogous for a regular tetrahedron).

Cf. A002193.

Sequence in context: A021373 A199950 A364873 * A011047 A347589 A345930

Adjacent sequences: A377272 A377273 A377274 * A377276 A377277 A377278

Keyword

nonn,cons,easy

Author

Paolo Xausa, Oct 23 2024

Status

approved