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 A349580 #5 Nov 22 2021 08:09:24 %S A349580 1,7,1,9,8,7,2,3,7,0,1,3,2,8,8,5,7,8,0,6,5,1,0,9,3,6,2,1,3,6,8,4,4,8, %T A349580 3,0,4,0,3,1,8,6,4,1,1,9,3,6,3,4,1,6,3,2,6,2,9,4,5,5,3,7,2,9,0,2,4,9, %U A349580 9,1,0,8,1,1,2,1,7,2,4,4,6,0,4,9,2,6,4,5,1,7,6,6,6,5,2,1,6,5,5,9 %N A349580 Decimal expansion of the 5-dimensional Steinmetz solid formed by the intersection of 5 unit-diameter 5-dimensional cylinders whose axes are mutually orthogonal and intersect at a single point. %C A349580 The constant given by Hildebrand et al. (2012) and Kong et al. (2013) is for unit-radius cylinders, and is thus larger by a factor of 2^5. The constant here, for a unit-diameter cylinders, is analogous to the 3-dimensional case given by Moore (1974). %H A349580 A. J. Hildebrand, Lingyi Kong, Abby Turner and Ananya Uppal, <a href="https://conf.math.illinois.edu/igl/Projects-Fall2012/Hildebrand2/report.pdf">Applications of n-dimensional Integrals: Random Points, Broken Sticks and Intersecting Cylinders</a>, Illinois Geometry Lab Project Report, University of Illinois at Urbana-Champaign, December 11, 2012. %H A349580 Lingyi Kong, Luvsandondov Lkhamsuren, Abigail Turner, Aananya Uppal and A. J. Hildebrand, <a href="https://faculty.math.illinois.edu/~hildebr/ugresearch/cylinder-spring2013report.pdf">Intersecting Cylinders: From Archimedes and Zu Chongzhi to Steinmetz and Beyond</a>, Illinois Geometry Lab Project Report, University of Illinois at Urbana-Champaign, April 25, 2013. %H A349580 Moreton Moore, <a href="http://www.jstor.org/stable/3615957">Symmetrical Intersections of Right Circular Cylinders</a>, The Mathematical Gazette, Vol. 58, No. 405 (1974), pp. 181-185. %F A349580 Equals 8 * (Pi/12 - arccot(2*sqrt(2))/sqrt(2)). %e A349580 0.17198723701328857806510936213684483040318641193634... %t A349580 RealDigits[8 * (Pi/12 - ArcCot[2*Sqrt[2]]/Sqrt[2]), 10, 100][[1]] %Y A349580 Cf. A101465, A188615, A349577, A349578, A349579. %K A349580 nonn,cons %O A349580 0,2 %A A349580 _Amiram Eldar_, Nov 22 2021