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 A385256 #9 Jun 25 2025 10:26:05 %S A385256 4,6,9,4,5,6,4,3,9,2,9,1,5,8,9,3,6,7,6,2,1,4,2,2,1,6,5,1,2,9,6,1,4,9, %T A385256 0,8,1,9,6,9,5,6,9,0,6,5,6,9,4,0,1,8,6,8,0,7,8,5,7,1,1,6,8,5,4,4,0,9, %U A385256 8,8,0,4,7,8,7,0,3,9,8,6,4,7,8,4,7,5,3,1,9,0 %N A385256 Decimal expansion of the volume of a gyroelongated triangular bicupola with unit edge. %C A385256 The gyroelongated triangular bicupola is Johnson solid J_44. %H A385256 Paolo Xausa, <a href="/A385256/b385256.txt">Table of n, a(n) for n = 1..10000</a> %H A385256 Wikipedia, <a href="https://en.wikipedia.org/wiki/Gyroelongated_triangular_bicupola">Gyroelongated triangular bicupola</a>. %F A385256 Equals sqrt(2)*(5/3 + sqrt(1 + sqrt(3))) = A002193*(5/3 + sqrt(A090388)). %F A385256 Equals the largest real root of 6561*x^8 - 198288*x^6 + 1506600*x^4 - 7125696*x^2 + 2704. %e A385256 4.6945643929158936762142216512961490819695690656940... %t A385256 First[RealDigits[Sqrt[2]*(5/3 + Sqrt[1 + Sqrt[3]]), 10, 100]] (* or *) %t A385256 First[RealDigits[PolyhedronData["J44", "Volume"], 10, 100]] %Y A385256 Cf. A385257 (surface area). %Y A385256 Cf. A002193, A002193, A384143. %K A385256 nonn,cons,easy %O A385256 1,1 %A A385256 _Paolo Xausa_, Jun 24 2025