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 A380796 #7 Feb 05 2025 09:23:15 %S A380796 1,1,9,7,6,2,2,6,0,8,7,5,6,3,7,9,7,8,9,0,8,1,3,2,8,4,2,9,8,4,2,1,0,3, %T A380796 9,8,5,8,2,1,8,9,3,5,9,1,0,2,4,5,6,1,2,8,2,0,1,8,0,2,8,8,7,8,3,6,2,8, %U A380796 8,4,6,0,8,9,4,6,7,2,3,5,8,9,2,7,4,0,0,4,7,6 %N A380796 Decimal expansion of the largest acute vertex angle, in radians, in a pentakis dodecahedron face. %C A380796 A pentakis dodecahedron face is an acute isoscele triangle with the smallest angles being A380795 and the largest angle being this constant. %H A380796 Paolo Xausa, <a href="/A380796/b380796.txt">Table of n, a(n) for n = 1..10000</a> %H A380796 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PentakisDodecahedron.html">Pentakis Dodecahedron</a>. %H A380796 Wikipedia, <a href="https://en.wikipedia.org/wiki/Pentakis_dodecahedron">Pentakis dodecahedron</a>. %F A380796 Equals arccos((9*A001622 - 8)/18). %F A380796 Equals Pi - 2*A380795. %e A380796 1.1976226087563797890813284298421039858218935910... %t A380796 First[RealDigits[ArcCos[(9*GoldenRatio - 8)/18], 10, 100]] %Y A380796 Cf. A001622, A379132, A379133, A379135, A379136, A380795. %K A380796 nonn,cons,easy %O A380796 1,3 %A A380796 _Paolo Xausa_, Feb 04 2025