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 A065007 #6 Jul 08 2024 11:36:06
%S A065007 5,18,39,52,68,85,105,126,149,150,175,202,203,232,263,264,296,297,332,
%T A065007 333,369,370,409,410,450,451,493,494,495,539,540,586,587,588,636,637,
%U A065007 687,688,689,740,741,742,796,797,798,853,854,855,913,914,915,974,975
%N A065007 Integers for which the periodic part of the continued fraction for the square root of n begins with 4.
%e A065007 The continued fraction for the square root of 39 is 6, {4, 12}.
%t A065007 Select[ Range[1000], First[ Last[ ContinuedFraction[ Sqrt[ # ]]]] == 4 & ]
%Y A065007 Cf. A065005.
%K A065007 easy,nonn
%O A065007 1,1
%A A065007 _Robert G. Wilson v_, Nov 01 2001