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 A031627 #14 Aug 18 2021 00:10:32 %S A031627 9629,31057,31765,32122,66733,86074,110513,111178,112514,114533, %T A031627 138745,140237,168541,170185,173497,203029,205738,209378,238769, %U A031627 239746,241706,242689,243674,244661,246641,248629,249626,323465,325741,328025 %N A031627 Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 39. %Y A031627 Subsequence of A003814. %K A031627 nonn %O A031627 1,1 %A A031627 _David W. Wilson_ %E A031627 First term 1522 removed by _Georg Fischer_, Jun 16 2019