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 A031670 #14 Aug 18 2021 00:10:32 %S A031670 42461,136981,137722,206237,208057,379681,383386,387109,487493,493093, %T A031670 497314,621305,750397,897338,899233,903029,1053301,1055354,1057409, %U A031670 1059466,1065649,1069781,1073921,1075994,1228393,1237273,1250653 %N A031670 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 82. %Y A031670 Subsequence of A003814. %K A031670 nonn %O A031670 1,1 %A A031670 _David W. Wilson_ %E A031670 First term 6725 removed by _Georg Fischer_, Jun 16 2019