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 A130204 #12 Feb 16 2025 08:33:06 %S A130204 4,7,3,8,7,7,2,6,2,2,4,2,3,2,5,8,2,9,7,9,7,9,2,8,1,5,8,7,4,1,4,3,9,7, %T A130204 9,1,1,1,7,3,4,7,0,8,9,6,4,4,3,0,9,6,8,4,3,9,2,2,4,1,1,2,7,3,0,7,7,0, %U A130204 9,4,2,2,0,9,8,7,0,2,7,7,4,6,1,6,8,3,7,7,3,0,2,4,4,2,3,8,3,9,0,2,7,4,0,1,3 %N A130204 Decimal expansion of the mean distance between two points picked at random in a quarter-disk. %H A130204 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/CircularSectorLinePicking.html">Circular Sector Line Picking</a>. %F A130204 Equals (32*(3 - 94*sqrt(2) + 48*Pi + 6*log(-2 + 2*sqrt(2))))/(135*Pi^2). %e A130204 0.47387726224232582979... %t A130204 RealDigits[32*(3 - 94*Sqrt[2] + 48*Pi + 6*Log[2*(Sqrt[2]-1)])/(135*Pi^2), 10, 100][[1]] (* _Amiram Eldar_, Jun 25 2021 *) %o A130204 (PARI) (32*(3 - 94*sqrt(2) + 48*Pi + 6*log(-2 + 2*sqrt(2))))/(135*Pi^2) \\ _Michel Marcus_, Jun 25 2021 %Y A130204 Cf. A093070, A130203. %K A130204 nonn,cons %O A130204 0,1 %A A130204 _Eric W. Weisstein_, May 16 2007