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 A380775 #7 Feb 03 2025 14:12:07 %S A380775 1,4,1,9,6,4,3,3,7,7,6,0,7,0,8,0,5,6,6,2,7,5,9,2,6,2,8,2,3,2,6,6,4,3, %T A380775 3,0,0,2,1,2,0,8,9,3,7,3,0,4,8,7,9,6,1,2,3,3,8,9,3,7,9,3,1,9,7,0,2,1, %U A380775 0,1,6,1,1,0,4,0,9,8,3,2,1,2,8,6,9,2,1,7,7,0 %N A380775 Decimal expansion of the long/short edge length ratio of a pentagonal icositetrahedron. %H A380775 Paolo Xausa, <a href="/A380775/b380775.txt">Table of n, a(n) for n = 1..10000</a> %H A380775 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/PentagonalIcositetrahedron.html">Pentagonal Icositetrahedron</a>. %H A380775 Wikipedia, <a href="https://en.wikipedia.org/wiki/Pentagonal_icositetrahedron">Pentagonal icositetrahedron</a>. %F A380775 Equals (A058265 + 1)/2. %F A380775 Equals the real root of 4*x^3 - 8*x^2 + 4*x - 1. %e A380775 1.419643377607080566275926282326643300212089373... %t A380775 First[RealDigits[Root[4*#^3 - 8*#^2 + 4*# - 1 &, 1], 10, 100]] %Y A380775 Cf. A058265, A378823, A378824, A378825, A378826, A378827, A380776, A380777. %K A380775 nonn,cons,easy %O A380775 1,2 %A A380775 _Paolo Xausa_, Feb 02 2025