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 A051985 #7 Sep 21 2021 07:09:01 %S A051985 511,559,606,790,1002,1065,1079,1182,1195,1374,1415,1510,1513,1537, %T A051985 1603,1687,1961,2193,2215,2455,2471,2627,2863,3155,3239,3295,3383, %U A051985 3647,3746,3857,4163,4295,4458,4535,4595,4727,4782,4847,4922,5038 %N A051985 Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 20. %D A051985 R. A. Mollin, Quadratics, CRC Press, 1996, Appendix A, Table A3. %H A051985 Georg Fischer, <a href="/A051985/b051985.txt">Table of n, a(n) for n = 1..161</a> %Y A051985 Cf. A051966-A051989. %K A051985 nonn,fini,full %O A051985 1,1 %A A051985 _N. J. A. Sloane_, Jan 04 2000