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 A020349 #21 Aug 21 2025 08:30:41
%S A020349 43,67,86,93,115,116,118,129,154,159,161,162,186,237,242,243,245,246,
%T A020349 259,286,292,297,339,344,345,354,375,403,411,451,452,453,459,464,465,
%U A020349 469,475,490,494,497,515,516,522,532,534,536,543,563,583,591,594,595,598,603,616
%N A020349 Numbers k such that the continued fraction for sqrt(k) has period 10.
%H A020349 Amiram Eldar, <a href="/A020349/b020349.txt">Table of n, a(n) for n = 1..10000</a> (terms 1..1000 from Harvey P. Dale)
%t A020349 cf10Q[n_]:=Module[{sr=Sqrt[n]},!IntegerQ[sr]&&Length[ ContinuedFraction[ sr][[2]]]==10]; Select[Range[700],cf10Q] (* _Harvey P. Dale_, Mar 07 2012 *)
%Y A020349 Contains A237604.
%K A020349 nonn
%O A020349 1,1
%A A020349 _David W. Wilson_