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 A377274 #10 Oct 25 2024 09:25:41 %S A377274 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, %T A377274 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, %U A377274 5,3,1,1,1,8,3,6,1,6,0,0,2,5,9,5,6,8,0,2,3,3 %N A377274 Decimal expansion of the surface area of a truncated tetrahedron with unit edge length. %H A377274 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/TruncatedTetrahedron.html">Truncated Tetrahedron</a>. %H A377274 Wikipedia, <a href="https://en.wikipedia.org/wiki/Truncated_tetrahedron">Truncated tetrahedron</a>. %F A377274 Equals 7*sqrt(3) = 7*A002194. %e A377274 12.12435565298214105469212439054110656859963677667... %t A377274 First[RealDigits[7*Sqrt[3], 10, 100]] (* or *) %t A377274 First[RealDigits[PolyhedronData["TruncatedTetrahedron", "SurfaceArea"], 10, 100]] %Y A377274 Cf. A377275 (volume), A377276 (circumradius), A093577 (midradius), A377277 (Dehn invariant). %Y A377274 Cf. A002194 (analogous for a regular tetrahedron). %K A377274 nonn,cons,easy %O A377274 2,2 %A A377274 _Paolo Xausa_, Oct 23 2024