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 A380940 #13 Feb 09 2025 20:11:00 %S A380940 5,7,1,9,4,9,2,5,6,1,1,9,3,8,6,8,5,5,9,8,4,1,5,4,6,2,7,1,5,5,3,3,8,2, %T A380940 4,1,5,0,7,3,0,4,0,5,4,6,7,3,1,0,2,8,4,8,6,4,8,0,5,2,5,5,1,4,4,3,6,4, %U A380940 2,2,1,3,0,7,6,9,6,6,1,0,6,7,3,0,2,8,3,6,1,9 %N A380940 Decimal expansion of the smallest vertex angle, in radians, in a disdyakis triacontahedron face. %C A380940 A disdyakis triacontahedron face is a scalene triangle with three acute angles. %H A380940 Paolo Xausa, <a href="/A380940/b380940.txt">Table of n, a(n) for n = 0..10000</a> %H A380940 Wikipedia, <a href="https://en.wikipedia.org/wiki/Disdyakis_triacontahedron">Disdyakis triacontahedron</a>. %F A380940 Equals arccos((2 + 5*A001622)/12). %F A380940 Equals Pi - A380941 - A380942. %e A380940 0.57194925611938685598415462715533824150730405467310... %t A380940 First[RealDigits[ArcCos[(2 + 5*GoldenRatio)/12], 10, 100]] %Y A380940 Cf. A380941 (middle face angle), A380942 (face largest face angle). %Y A380940 Cf. A001622, A379388, A379708, A379709, A379710, A379711. %K A380940 nonn,cons,easy %O A380940 0,1 %A A380940 _Paolo Xausa_, Feb 08 2025