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 A380793 #8 Feb 05 2025 09:23:27 %S A380793 5,3,1,9,8,2,0,2,0,7,4,1,9,6,6,0,9,5,6,3,9,2,0,8,5,6,1,2,9,2,3,2,4,9, %T A380793 3,8,2,6,4,1,9,1,3,7,9,1,3,9,2,0,7,1,2,0,4,8,5,5,8,8,6,7,3,8,5,1,7,2, %U A380793 7,3,0,5,8,9,5,8,5,4,0,0,4,1,9,5,0,5,5,4,2,4 %N A380793 Decimal expansion of the acute vertex angles, in radians, in a triakis icosahedron face. %C A380793 A triakis icosahedron face is an isoscele triangle with two acute angles (this constant) and one obtuse angle (A380794). %H A380793 Paolo Xausa, <a href="/A380793/b380793.txt">Table of n, a(n) for n = 0..10000</a> %H A380793 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/TriakisIcosahedron.html">Triakis Icosahedron</a>. %H A380793 Wikipedia, <a href="https://en.wikipedia.org/wiki/Triakis_icosahedron">Triakis icosahedron</a>. %F A380793 Equals arccos((A001622 + 7)/10). %F A380793 Equals (Pi - A380794)/2. %e A380793 0.5319820207419660956392085612923249382641913791392... %t A380793 First[RealDigits[ArcCos[(GoldenRatio + 7)/10], 10, 100]] %Y A380793 Cf. A001622, A378973, A378974, A378976, A378977, A380794. %K A380793 nonn,cons,easy %O A380793 0,1 %A A380793 _Paolo Xausa_, Feb 04 2025