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 A385505 #9 Jul 01 2025 08:29:13 %S A385505 9,0,4,4,1,7,2,2,2,6,8,3,2,5,1,0,0,6,3,1,5,7,5,7,8,2,6,7,7,9,7,0,0,7, %T A385505 8,4,5,9,2,2,5,8,6,0,5,2,4,4,9,1,1,1,8,1,4,0,6,1,7,8,3,2,4,1,9,3,2,2, %U A385505 7,4,1,3,7,1,4,5,6,9,0,2,2,2,2,0,4,1,5,7,2,4 %N A385505 Decimal expansion of the volume of a biaugmented triangular prism with unit edge. %C A385505 The biaugmented triangular prism is Johnson solid J_50. %H A385505 Paolo Xausa, <a href="/A385505/b385505.txt">Table of n, a(n) for n = 0..10000</a> %H A385505 Wikipedia, <a href="https://en.wikipedia.org/wiki/Biaugmented_triangular_prism">Biaugmented triangular prism</a>. %F A385505 Equals sqrt(59/144 + 1/sqrt(6)) = sqrt(59/144 + A020763). %F A385505 Equals the largest root of 20736*x^4 - 16992*x^2 + 25. %e A385505 0.90441722268325100631575782677970078459225860524491... %t A385505 First[RealDigits[Sqrt[59/144 + 1/Sqrt[6]], 10, 100]] (* or *) %t A385505 First[RealDigits[PolyhedronData["J50", "Volume"], 10, 100]] %Y A385505 Cf. A384141 (surface area + 4). %Y A385505 Cf. A020763, A385506. %K A385505 nonn,cons,easy %O A385505 0,1 %A A385505 _Paolo Xausa_, Jul 01 2025