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 A212113 #16 Jun 02 2025 07:55:10
%S A212113 1,1,3,4,19,23,939,962,9597,39350,88297,127647,2003002,4133651,
%T A212113 51606814,55740465,1222156579,1277897044,22946406327,1194491026048,
%U A212113 3606419484471,4800910510519,32411882547585
%N A212113 Denominators of convergents to the Dottie number, A003957.
%H A212113 G. C. Greubel, <a href="/A212113/b212113.txt">Table of n, a(n) for n = 0..1000</a>
%H A212113 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/DottieNumber.html">Dottie Number</a>
%t A212113 z = FindRoot[Cos[x] == x, {x, 0, 1}, WorkingPrecision -> 10000][[1, -1]]; Denominator[Convergents[z, 100]]
%Y A212113 Cf. A003957, A212112.
%K A212113 nonn,frac
%O A212113 0,3
%A A212113 _Ben Branman_, May 01 2012