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 A232813 #18 May 17 2023 08:41:34 %S A232813 5,5,3,5,8,1,0,4,4,5,9,3,2,0,8,5,2,5,7,2,9,0,4,1,1,6,3,8,7,6,6,9,6,4, %T A232813 0,8,0,3,4,0,1,0,8,7,9,8,6,4,7,8,5,4,9,8,8,1,7,6,5,2,6,9,2,0,0,0,4,3, %U A232813 0,3,8,3,1,5,1,2,7,9,8,9,5,1,9,6,5,9,2,8,4,3,5,9,1,6,0,8,1,3,5,4,0,4,1,6,7 %N A232813 Decimal expansion of the minimum surface index of a closed cylinder. %C A232813 Equivalently, the minimum surface area among all closed cylinders (cans) enclosing a unit volume. It is attained when the cylinder is right circular and its height matches the diameter of its base. For evident reasons, this value should be called the 'cannery constant'. Its determination is a nice exercise in elementary analysis. %C A232813 For a general definition of surface index, see A232808. %H A232813 Stanislav Sykora, <a href="/A232813/b232813.txt">Table of n, a(n) for n = 1..1000</a> %H A232813 Wikipedia, <a href="http://en.wikipedia.org/wiki/Cylinder_%28geometry%29">Cylinder (geometry)</a>. %F A232813 Equals (54*Pi)^(1/3) = 3*(2*Pi)^(1/3). %e A232813 5.53581044593208525729041163876696408034010879864785498817652692... %t A232813 RealDigits[3 * Surd[2 * Pi, 3], 10, 120][[1]] (* _Amiram Eldar_, May 17 2023 *) %Y A232813 Cf. Other surface indices: A232808 (spheres), A232809, A232810, A232811, A232812 (platonic solids), A232814 (open cylinders), A232815 (closed cones), A232816 (open cones), A232817 (open tubes). %K A232813 nonn,cons,easy %O A232813 1,1 %A A232813 _Stanislav Sykora_, Dec 03 2013