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 A232816 #10 Nov 23 2022 16:18:26 %S A232816 4,1,8,8,0,7,7,9,4,8,6,2,3,1,3,8,1,2,8,7,2,5,5,9,7,2,0,5,9,3,6,6,8,8, %T A232816 1,1,9,4,4,0,5,2,7,5,8,8,7,0,4,3,4,9,6,8,6,2,1,2,8,3,0,5,7,4,3,1,7,8, %U A232816 2,3,9,8,3,2,7,7,8,7,2,3,9,4,2,9,5,1,8,6,8,5,8,9,7,9,0,0,8,7,3,2,1,4,2,1,6 %N A232816 Decimal expansion of the minimum surface index of an open cone. %C A232816 Equivalently, minimum external surface area among all open cones (not counting the base) enclosing a unit volume. It is attained when the cone is right circular and its height equals the radius of its base multiplied by sqrt(2). We might call it the 'teepee constant', related to the need to minimize the material needed to construct it. %C A232816 For a general definition of surface index, see A232808. %H A232816 Stanislav Sykora, <a href="/A232816/b232816.txt">Table of n, a(n) for n = 1..1000</a> %H A232816 Wikipedia, <a href="http://en.wikipedia.org/wiki/Cone">Cone</a> %F A232816 3*sqrt(3)*(Pi/6)^(1/3). %e A232816 4.18807794862313812872559720593668811944052758870434968621283... %t A232816 RealDigits[3 Sqrt[3]Surd[Pi/6,3],10,120][[1]] (* _Harvey P. Dale_, Nov 23 2022 *) %Y A232816 Cf. Other surface indices: A232808 (spheres), A232809, A232810, A232811, A232812 (platonic solids), A232813 (closed cylinders), A232814 (open cylinders), A232815 (closed cones), A232817 (open tubes). %K A232816 nonn,cons,easy %O A232816 1,1 %A A232816 _Stanislav Sykora_, Dec 05 2013