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 A380700 #10 Jan 30 2025 17:44:03 %S A380700 5,8,5,6,8,5,5,4,3,4,5,7,1,5,0,9,5,9,6,1,7,7,5,7,5,3,8,4,7,7,5,1,7,7, %T A380700 6,6,2,0,0,3,6,1,0,6,7,1,7,1,6,4,1,5,0,2,6,5,0,5,5,9,3,2,7,2,2,1,2,6, %U A380700 4,9,2,2,1,3,3,2,4,0,3,3,8,8,2,2,0,0,2,6,3,3 %N A380700 Decimal expansion of the acute vertex angles, in radians, in a triakis tetrahedron face. %H A380700 Paolo Xausa, <a href="/A380700/b380700.txt">Table of n, a(n) for n = 0..10000</a> %H A380700 Wikipedia, <a href="https://en.wikipedia.org/wiki/Triakis_tetrahedron">Triakis tetrahedron</a>. %F A380700 Equals arccos(5/6). %F A380700 Equals (Pi - A380701)/2. %e A380700 0.58568554345715095961775753847751776620036106717164... %t A380700 First[RealDigits[ArcCos[5/6], 10, 100]] %Y A380700 Cf. A380701 (face obtuse angle). %Y A380700 Cf. A378204, A378205, A378206, A378207, A378208. %K A380700 nonn,cons,easy %O A380700 0,1 %A A380700 _Paolo Xausa_, Jan 30 2025