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 A377276 #9 Oct 25 2024 09:26:10 %S A377276 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, %T A377276 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, %U A377276 5,6,1,5,8,1,8,8,3,0,9,9,3,0,3,7,0,5,2,8,8,9 %N A377276 Decimal expansion of the circumradius of a truncated tetrahedron with unit edge length. %H A377276 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/TruncatedTetrahedron.html">Truncated Tetrahedron</a>. %H A377276 Wikipedia, <a href="https://en.wikipedia.org/wiki/Truncated_tetrahedron">Truncated tetrahedron</a>. %F A377276 Equals sqrt(22)/4 = A010478/4. %e A377276 1.17260393995585738864140752838611657014705708835... %t A377276 First[RealDigits[Sqrt[22]/4, 10, 100]] (* or *) %t A377276 First[RealDigits[PolyhedronData["TruncatedTetrahedron", "Circumradius"], 10, 100]] %Y A377276 Cf. A377274 (surface area), A377275 (volume), A093577 (midradius), A377277 (Dehn invariant). %Y A377276 Cf. A187110 (analogous for a regular tetrahedron). %Y A377276 Cf. A010478. %K A377276 nonn,cons,easy %O A377276 1,3 %A A377276 _Paolo Xausa_, Oct 23 2024