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 A031607 #14 Aug 18 2021 00:10:32 %S A031607 4538,4673,7477,7825,11785,16553,22129,22426,26533,26858,27514,28513, %T A031607 34217,40441,43705,48053,50258,52058,57269,57746,58706,59674,60161, %U A031607 61141,62129,62626,68329,72553,77017,78125,79241,80365,81497,83785,88577,90362 %N A031607 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 19. %Y A031607 Subsequence of A003814. %K A031607 nonn %O A031607 1,1 %A A031607 _David W. Wilson_ %E A031607 First term 362 removed by _Georg Fischer_, Jun 16 2019