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 A386691 #8 Jul 31 2025 08:43:19 %S A386691 3,6,9,6,7,2,3,3,1,4,5,8,3,1,5,8,0,8,0,3,4,0,9,7,8,0,5,7,2,7,6,0,6,3, %T A386691 5,2,9,5,3,3,8,4,8,6,3,3,0,0,9,6,0,4,7,7,0,2,2,5,7,4,7,7,0,4,5,0,8,7, %U A386691 6,7,4,3,8,0,3,1,5,0,4,0,8,2,8,4,5,3,4,5,3,4 %N A386691 Decimal expansion of the volume of a parabidiminished rhombicosidodecahedron with unit edges. %C A386691 The parabidiminished rhombicosidodecahedron is Johnson solid J_80. %C A386691 Also the volume of a metabidiminished rhombicosidodecahedron and a gyrate bidiminished rhombicosidodecahedron (Johnson solids J_81 and J_82, respectively) with unit edges. %H A386691 Paolo Xausa, <a href="/A386691/b386691.txt">Table of n, a(n) for n = 2..10000</a> %H A386691 Wikipedia, <a href="https://en.wikipedia.org/wiki/Gyrate_bidiminished_rhombicosidodecahedron">Gyrate bidiminished rhombicosidodecahedron</a>. %H A386691 Wikipedia, <a href="https://en.wikipedia.org/wiki/Metabidiminished_rhombicosidodecahedron">Metabidiminished rhombicosidodecahedron</a>. %H A386691 Wikipedia, <a href="https://en.wikipedia.org/wiki/Parabidiminished_rhombicosidodecahedron">Parabidiminished rhombicosidodecahedron</a>. %F A386691 Equals (5/3)*(11 + 5*sqrt(5)) = (5/3)*(11 + 5*A002163). %F A386691 Equals A185093 - 2*A179590. %F A386691 Equals (50/3)*A001622 + 10 = A134946*100 + 10. %F A386691 Equals the largest root of 9*x^2 - 330*x - 100. %e A386691 36.967233145831580803409780572760635295338486330... %t A386691 First[RealDigits[5/3*(11 + 5*Sqrt[5]), 10, 100]] (* or *) %t A386691 First[RealDigits[PolyhedronData["J80", "Volume"], 10, 100]] %Y A386691 Cf. A386692 (surface area). %Y A386691 Cf. A001622, A002163, A134946, A179590, A185093, A386689, A386693. %K A386691 nonn,cons,easy %O A386691 2,1 %A A386691 _Paolo Xausa_, Jul 30 2025