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 A102519 #26 Feb 16 2025 08:32:55 %S A102519 5,8,6,5,0,3,3,2,8,4,3,3,6,5,5,9,6,2,8,6,6,5,0,5,1,2,6,2,6,5,2,7,2,9, %T A102519 1,8,9,5,1,9,6,0,1,3,9,7,2,5,0,1,9,5,1,0,4,0,0,4,7,5,4,8,4,7,8,1,7,2, %U A102519 7,2,7,2,3,9,8,0,4,7,6,5,3,8,6,9,7,1,4,9,7,8,3,8,2,6,2,1,8 %N A102519 Decimal expansion of 1-(3*sqrt(3))/(4*Pi). %C A102519 This is the probability that a Gaussian triangle in 3 dimensions is obtuse. %C A102519 Also the probability that the distance between 2 randomly selected points within a circle will be smaller than the radius. - _Amiram Eldar_, Mar 03 2019 %H A102519 G. C. Greubel, <a href="/A102519/b102519.txt">Table of n, a(n) for n = 0..5000</a> %H A102519 M. W. Crofton, <a href="https://archive.org/stream/mathematicalque02unkngoog#page/n84/mode/2up">Problem 1829</a>, solved by J. J. Sylvester and by the proposer, Mathematical Questions with Their Solutions: From the "Educational Times", Vol. 4 (1866), pp. 77-78. %H A102519 S. R. Finch, <a href="/A102519/a102519.pdf">Random Triangles</a>, Jan 21 2010. [Cached copy, with permission of the author] %H A102519 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/GaussianTrianglePicking.html">Gaussian Triangle Picking</a> %H A102519 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a> %e A102519 0.58650332843365596286650512626527291895196013972501951040047548478172727... %t A102519 RealDigits[1 - (3*Sqrt[3])/(4*Pi), 10, 50][[1]] (* _G. C. Greubel_, Jun 02 2017 *) %o A102519 (PARI) 1 - (3*sqrt(3))/(4*Pi) \\ _G. C. Greubel_, Jun 02 2017 %Y A102519 Cf. A102520, A240935. %K A102519 cons,nonn %O A102519 0,1 %A A102519 Mark Hudson (mrmarkhudson(AT)hotmail.com), Jan 13 2005