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 A319883 #18 Feb 16 2025 08:33:56 %S A319883 7,4,7,4,4,1,7,1,8,2,0,9,1,3,3,9,6,1,8,3,9,9,5,9,4,6,5,6,6,6,3,2,0,5, %T A319883 6,8,0,4,4,1,0,0,5,7,1,7,4,3,0,4,8,4,0,8,5,6,7,1,9,3,1,4,7,4,4,7,0,8, %U A319883 1,1,1,7,6,8,5,6,0,4,0,2 %N A319883 Decimal expansion of the steradian solid angle subtended by one pentagonal facet of the icosidodecahedron. %H A319883 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Icosidodecahedron.html">Icosidodecahedron</a> %H A319883 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/SphericalPolygon.html">Spherical Polygon</a> %F A319883 Equals 2*Pi - 5*arctan(2). %F A319883 Equals (Pi - 5*A319881)/3. %e A319883 0.74744171820913396183995946566632056804410057174304... %t A319883 RealDigits[2*Pi - 5*ArcTan[2], 10, 80][[1]] %Y A319883 Cf. A319881. Cuboctahedron: A236555, A236556. %K A319883 nonn,cons %O A319883 0,1 %A A319883 _Bradley Klee_, Sep 30 2018