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 A381125 #11 Feb 14 2025 23:11:13 %S A381125 1,2,13,15,58,305,1278,28421,29699,58120,262179,320299,902777, %T A381125 76153567,77056344,307322599,384378943,2613596257,2997975200, %U A381125 11607521857,14605497057,143056995370,157662492427,300719487797,458381980224,759101468021,14881309872623 %N A381125 Denominators of the convergents to the supergolden ratio. %H A381125 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Convergent.html">Convergent</a>. %H A381125 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Denominator.html">Denominator</a>. %H A381125 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/SupergoldenRatio.html">Supergolden Ratio</a>. %t A381125 Denominator[Convergents[Root[-1 - #^2 + #^3&, 1, 0], 20]] %Y A381125 Cf. A092526 (decimal digits), A369346 (continued fraction). %Y A381125 Cf. A381124 (numerators of convergents). %K A381125 nonn,frac,easy %O A381125 0,2 %A A381125 _Eric W. Weisstein_, Feb 14 2025