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 A386739 #11 Aug 01 2025 09:19:50 %S A386739 1,5,1,5,3,5,1,6,3,9,9,7,6,4,0,6,5,5,9,7,2,8,4,7,9,3,1,2,4,7,1,8,1,2, %T A386739 9,0,4,8,2,2,8,6,9,5,0,6,8,0,8,7,9,4,2,6,6,7,5,9,9,0,4,6,3,0,5,1,0,3, %U A386739 0,9,2,7,0,6,4,4,3,2,9,3,0,7,9,9,0,9,2,3,6,5 %N A386739 Decimal expansion of the volume of a sphenocorona with unit edges. %C A386739 The sphenocorona is Johnson solid J_86. %H A386739 Paolo Xausa, <a href="/A386739/b386739.txt">Table of n, a(n) for n = 1..10000</a> %H A386739 Wikipedia, <a href="https://en.wikipedia.org/wiki/Sphenocorona">Sphenocorona</a>. %F A386739 Equals sqrt(1 + 3*sqrt(3/2) + sqrt(13 + 3*sqrt(6)))/2 = sqrt(1 + 3*A115754 + sqrt(13 + A010507))/2. %F A386739 Equals A386740 - A020775. %F A386739 Equals the largest real root of 1024*x^8 - 1024*x^6 - 3008*x^4 - 96*x^2 + 9. %e A386739 1.5153516399764065597284793124718129048228695068... %t A386739 First[RealDigits[Sqrt[1 + 3*Sqrt[3/2] + Sqrt[13 + Sqrt[54]]]/2, 10, 100]] (* or *) %t A386739 First[RealDigits[PolyhedronData["J86", "Volume"], 10, 100]] %Y A386739 Cf. A010482 (surface area - 2), A178809 (surface area + 4). %Y A386739 Cf. A010507, A020775, A115754, A386740, A386741. %K A386739 nonn,cons,easy %O A386739 1,2 %A A386739 _Paolo Xausa_, Aug 01 2025