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 A031698 #16 Jul 15 2021 01:46:51 %S A031698 101,402,903,1604,2505,3606,4907,6408,8109,10010,12111,14412,16913, %T A031698 19614,22515,25616,28917,32418,36119,40020,44121,48422,48862,52923, %U A031698 57624,62525,67626,72927,78428,84129,90030,96131,102432,108933,115634,122535,129636 %N A031698 Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 20. %H A031698 Charles R Greathouse IV, <a href="/A031698/b031698.txt">Table of n, a(n) for n = 1..10000</a> %t A031698 Select[Range[200000],!IntegerQ[Sqrt[#]]&&Min[ContinuedFraction[Sqrt[#]][[2]]]==20&] (* _Vincenzo Librandi_, Feb 06 2012 *) %Y A031698 Different from A055438. %K A031698 nonn %O A031698 1,1 %A A031698 _David W. Wilson_