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 A102520 #20 Feb 16 2025 08:32:56 %S A102520 3,7,9,7,5,4,9,9,2,6,5,0,4,8,3,9,4,4,2,9,9,7,5,7,6,8,9,3,9,7,9,0,9,3, %T A102520 7,8,4,2,7,9,4,0,2,0,9,5,8,7,5,2,9,2,6,5,6,0,0,7,1,3,2,2,7,1,7,2,5,9, %U A102520 0,9,0,8,5,9,7,0,7,1,4,8,0,8,0,4,5,7,2,4,6,7,5,7,3,9,3,2,7,4,9,6,4,1,3,3,9 %N A102520 Decimal expansion of 1-(9*sqrt(3))/(8*Pi). %C A102520 This is the probability that a Gaussian triangle in 5 dimensions is obtuse. %C A102520 Also, the probability that the distance between 2 randomly selected points within a 4-dimensional ball will be smaller than its radius. - _Amiram Eldar_, Apr 14 2022 %H A102520 G. C. Greubel, <a href="/A102520/b102520.txt">Table of n, a(n) for n = 0..5000</a> %H A102520 Steven R. Finch, <a href="/A102519/a102519.pdf">Random Triangles</a>, January 21, 2010. [Cached copy, with permission of the author] %H A102520 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/BallLinePicking.html">Ball Line Picking</a>. %H A102520 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/GaussianTrianglePicking.html">Gaussian Triangle Picking</a>. %H A102520 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a> %t A102520 RealDigits[1 - (9*Sqrt[3])/(8*Pi), 10, 50][[1]] (* _G. C. Greubel_, Jun 02 2017 *) %o A102520 (PARI) 1 - (9*sqrt(3))/(8*Pi) \\ _G. C. Greubel_, Jun 01 2017 %Y A102520 Cf. A102519. %K A102520 cons,nonn %O A102520 0,1 %A A102520 Mark Hudson (mrmarkhudson(AT)hotmail.com), Jan 13 2005