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 A249539 #17 Feb 16 2025 08:33:24 %S A249539 6,7,7,0,2,7,5,0,0,2,5,7,3,0,7,5,4,4,3,3,7,6,9,5,3,4,1,8,7,2,9,2,7,1, %T A249539 0,3,0,1,2,8,6,0,7,5,5,1,9,4,7,9,8,6,2,8,2,1,2,9,0,2,8,6,6,0,5,2,7,7, %U A249539 0,9,6,2,1,2,9,7,9,2,0,9,7,3,8,4,0,9,2,3,9,2,2,4,2,5,2,8,8,3,6,1,3,1,6,3,4 %N A249539 Decimal expansion of 12/sqrt(Pi), the average perimeter of a random Gaussian triangle in three dimensions. %H A249539 G. C. Greubel, <a href="/A249539/b249539.txt">Table of n, a(n) for n = 1..5000</a> %H A249539 Steven R. Finch, <a href="/A102519/a102519.pdf">Random Triangles</a>, Jan 21 2010. [Cached copy, with permission of the author] %H A249539 Eric Weisstein's MathWorld, <a href="https://mathworld.wolfram.com/GaussianTrianglePicking.html">Gaussian Triangle Picking</a> %H A249539 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a> %e A249539 6.770275002573075443376953418729271030128607551947986282129... %t A249539 RealDigits[12/Sqrt[Pi], 10, 105] // First %o A249539 (PARI) 12/sqrt(Pi) \\ _Charles R Greathouse IV_, Apr 20 2016 %Y A249539 Cf. A102519, A102520, A102558, A102559, A249521 (average side length in three dimensions), A249538 (average perimeter in two dimensions). %K A249539 nonn,cons,easy %O A249539 1,1 %A A249539 _Jean-François Alcover_, Oct 31 2014