A377276 Decimal expansion of the circumradius of a truncated tetrahedron with unit edge length.

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

Offset: 1

Author

Paolo Xausa, Oct 23 2024

Keywords

• nonn
• cons
• easy

Examples

			1.17260393995585738864140752838611657014705708835...
		

Links

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

Crossrefs

Cf. A377274 (surface area), A377275 (volume), A093577 (midradius), A377277 (Dehn invariant).

Cf. A187110 (analogous for a regular tetrahedron).

Cf. A010478.

Programs

Mathematica

First[RealDigits[Sqrt[22]/4, 10, 100]] (* or *)
First[RealDigits[PolyhedronData["TruncatedTetrahedron", "Circumradius"], 10, 100]]

Formula

Equals sqrt(22)/4 = A010478/4.