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 A384141 #9 May 22 2025 05:19:54 %S A384141 9,3,3,0,1,2,7,0,1,8,9,2,2,1,9,3,2,3,3,8,1,8,6,1,5,8,5,3,7,6,4,6,8,0, %T A384141 9,1,7,3,5,7,0,1,3,1,3,4,5,2,5,9,5,1,5,7,0,1,3,9,5,1,7,4,4,8,6,2,9,8, %U A384141 3,2,5,4,2,2,7,2,0,0,0,0,9,2,7,0,2,8,6,5,4,6 %N A384141 Decimal expansion of the surface area of an elongated pentagonal bipyramid with unit edge. %C A384141 The elongated pentagonal bipyramid is Johnson solid J_16. %H A384141 Paolo Xausa, <a href="/A384141/b384141.txt">Table of n, a(n) for n = 1..10000</a> %H A384141 Wikipedia, <a href="https://en.wikipedia.org/wiki/Elongated_pentagonal_bipyramid">Elongated pentagonal bipyramid</a>. %F A384141 Equals 5*(2 + sqrt(3))/2 = 5*(2 + A002194)/2. %F A384141 Equals the largest root of 4*x^2 - 40*x + 25. %e A384141 9.3301270189221932338186158537646809173570131345... %t A384141 First[RealDigits[5*(2 + Sqrt[3])/2, 10, 100]] (* or *) %t A384141 First[RealDigits[PolyhedronData["J16", "SurfaceArea"], 10, 100]] %Y A384141 Cf. A384140 (volume). %Y A384141 Cf. A002163. %Y A384141 Essentially the same as A120011. %K A384141 nonn,cons,easy %O A384141 1,1 %A A384141 _Paolo Xausa_, May 20 2025