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 A249538 #15 Feb 16 2025 08:33:24 %S A249538 5,3,1,7,3,6,1,5,5,2,7,1,6,5,4,8,0,8,1,8,9,4,5,0,2,4,5,0,0,2,3,4,3,5, %T A249538 5,4,8,3,9,2,6,4,8,3,6,8,3,6,7,1,6,1,3,8,4,6,4,1,4,2,3,3,6,9,5,5,8,7, %U A249538 3,3,8,5,3,7,7,3,0,9,6,5,4,4,1,2,4,8,5,1,9,7,0,2,1,5,6,3,3,9,9,6,2,4,8,6,8 %N A249538 Decimal expansion of 3*sqrt(Pi), the average perimeter of a random Gaussian triangle in two dimensions. %H A249538 G. C. Greubel, <a href="/A249538/b249538.txt">Table of n, a(n) for n = 1..5000</a> %H A249538 Steven R. Finch, <a href="/A102519/a102519.pdf">Random Triangles</a>, Jan 21 2010. [Cached copy, with permission of the author] %H A249538 Eric Weisstein's MathWorld, <a href="https://mathworld.wolfram.com/GaussianTrianglePicking.html">Gaussian Triangle Picking</a> %H A249538 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a> %e A249538 5.317361552716548081894502450023435548392648368367161... %t A249538 RealDigits[3*Sqrt[Pi], 10, 105] // First %o A249538 (PARI) 3*sqrt(Pi) \\ _G. C. Greubel_, Jan 09 2017 %Y A249538 Cf. A002161 (average side length in two dimensions), A102556, A102557. %K A249538 nonn,cons,easy %O A249538 1,1 %A A249538 _Jean-François Alcover_, Oct 31 2014