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 A344075 #10 Nov 21 2024 07:56:38 %S A344075 2,4,8,9,2,3,4,5,1,3,8,0,5,4,2,5,0,5,2,4,6,7,2,5,2,7,5,1,6,3,5,6,8,0, %T A344075 3,0,9,8,3,1,8,6,1,4,7,9,4,1,2,1,2,6,0,7,9,1,8,0,2,1,6,6,4,5,6,0,1,6, %U A344075 7,2,8,2,2,4,6,5,1,6,9,4,6,5,7,1,8,4,6,7,6,8,0,9 %N A344075 Decimal expansion of arccos(-sqrt((5+2*sqrt(5))/15)). %C A344075 Decimal expansion of the dihedral angle (radians) of an icosidodecahedron. Equals approximately 142.62 degrees. %H A344075 Wikipedia, <a href="https://en.wikipedia.org/wiki/Icosidodecahedron">Icosidodecahedron</a> %H A344075 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a> %e A344075 2.489234513805425052467... %t A344075 RealDigits[ArcCos[-Sqrt[(5 + 2 Sqrt[5])/15]], 10, 200][[1]] %o A344075 (PARI) acos(-sqrt((5+2*sqrt(5))/15)) \\ _Michel Marcus_, May 09 2021 %Y A344075 Cf. A179450 (icosidodecahedron volume), A179451 (icosidodecahedron surface area). %K A344075 cons,nonn %O A344075 1,1 %A A344075 _Wesley Ivan Hurt_, May 08 2021