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 A065006 #7 Jul 07 2024 13:45:12
%S A065006 11,28,40,53,69,86,87,106,127,128,151,152,176,177,204,205,233,234,235,
%T A065006 265,266,298,299,300,334,335,336,371,372,373,411,412,413,452,453,454,
%U A065006 455,496,497,498,541,542,543,544,589,590,591,592,638,639,640,641,690
%N A065006 Integers for which the periodic part of the continued fraction for the square root of n begins with 3.
%e A065006 The continued fraction for the square root of 11 is 3, {3, 6}.
%t A065006 Select[ Range[800], First[ Last[ ContinuedFraction[ Sqrt[ # ]]]] == 3 & ]
%Y A065006 Cf. A065005.
%K A065006 easy,nonn
%O A065006 1,1
%A A065006 _Robert G. Wilson v_, Nov 01 2001