This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A377275 #8 Oct 25 2024 09:25:56 %S A377275 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, %T A377275 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, %U A377275 0,3,9,1,7,0,5,2,3,7,1,8,2,4,4,6,3,2,4,2,7,7 %N A377275 Decimal expansion of the volume of a truncated tetrahedron with unit edge length. %H A377275 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/TruncatedTetrahedron.html">Truncated Tetrahedron</a>. %H A377275 Wikipedia, <a href="https://en.wikipedia.org/wiki/Truncated_tetrahedron">Truncated tetrahedron</a>. %F A377275 Equals (23/12)*sqrt(2) = (23/12)*A002193. %e A377275 2.7105759945484321768699033880685879839252044278... %t A377275 First[RealDigits[23/12*Sqrt[2], 10, 100]] (* or *) %t A377275 First[RealDigits[PolyhedronData["TruncatedTetrahedron", "Volume"], 10, 100]] %Y A377275 Cf. A377274 (surface area), A377276 (circumradius), A093577 (midradius), A377277 (Dehn invariant). %Y A377275 Cf. A020829 (analogous for a regular tetrahedron). %Y A377275 Cf. A002193. %K A377275 nonn,cons,easy %O A377275 1,1 %A A377275 _Paolo Xausa_, Oct 23 2024