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 A386742 #6 Aug 01 2025 09:22:24 %S A386742 1,0,7,9,4,2,2,8,6,3,4,0,5,9,9,4,7,8,2,0,8,7,3,5,0,8,5,3,6,7,7,6,4,2, %T A386742 5,6,5,1,2,4,2,6,2,3,6,4,2,1,4,6,7,1,2,8,2,6,2,5,1,1,3,1,4,0,7,5,3,3, %U A386742 6,9,8,5,7,6,0,8,9,6,0,0,1,6,6,8,6,5,1,5,7,8 %N A386742 Decimal expansion of the surface area of a hebesphenomegacorona with unit edges. %C A386742 The hebesphenomegacorona is Johnson solid J_89. %H A386742 Paolo Xausa, <a href="/A386742/b386742.txt">Table of n, a(n) for n = 2..10000</a> %H A386742 Wikipedia, <a href="https://en.wikipedia.org/wiki/Hebesphenomegacorona">Hebesphenomegacorona</a>. %F A386742 Equals 3 + (9/2)*sqrt(3) = 3 + (9/2)*A002194. %e A386742 10.794228634059947820873508536776425651242623642... %t A386742 First[RealDigits[3 + 9/2*Sqrt[3], 10, 100]] (* or *) %t A386742 First[RealDigits[PolyhedronData["J89", "SurfaceArea"], 10, 100]] %Y A386742 Cf. A386741 (volume). %Y A386742 Cf. A002194. %K A386742 nonn,cons,easy %O A386742 2,3 %A A386742 _Paolo Xausa_, Aug 01 2025