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 A386000 #11 Jul 19 2025 10:11:30 %S A386000 1,2,7,7,1,8,6,4,9,3,4,3,7,4,3,8,6,6,1,4,5,2,6,7,5,6,5,3,3,7,9,9,5,5, %T A386000 5,6,8,6,7,0,1,8,0,3,5,4,8,8,6,6,9,5,0,0,2,9,1,2,3,4,5,0,2,9,9,1,1,4, %U A386000 0,1,9,3,6,6,4,4,3,5,9,7,6,2,3,2,9,2,0,4,2,0 %N A386000 Decimal expansion of the volume of a tridiminished icosahedron with unit edge. %C A386000 The tridiminished icosahedron is Johnson solid J_63. %H A386000 Paolo Xausa, <a href="/A386000/b386000.txt">Table of n, a(n) for n = 1..10000</a> %H A386000 Wikipedia, <a href="https://en.wikipedia.org/wiki/Tridiminished_icosahedron">Tridiminished icosahedron</a>. %F A386000 Equals 5/8 + 7*sqrt(5)/24 = 5/8 + 7*A002163/24. %F A386000 Equals A102208 - 3*A179552 = A386002 - A020829. %F A386000 Equals the largest root of 144*x^2 - 180*x - 5. %e A386000 1.277186493437438661452675653379955568670180... %t A386000 First[RealDigits[5/8 + 7*Sqrt[5]/24, 10, 100]] (* or *) %t A386000 First[RealDigits[PolyhedronData["J63", "Volume"], 10, 100]] %Y A386000 Cf. A386001 (surfacea area). %Y A386000 Cf. A002163, A020829, A102208, A179552, A385857, A386002. %K A386000 nonn,cons,easy %O A386000 1,2 %A A386000 _Paolo Xausa_, Jul 14 2025