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 A053330 #9 Dec 20 2021 02:46:33 %S A053330 10,15,26,30,34,35,39,42,51,65,66,78,85,87,95,102,105,110,119,122,123, %T A053330 138,143,146,165,182,194,203,205,215,221,222,230,258,285,287,318,327, %U A053330 357,362,365,395,402,429,447,482,485,527,533,623,629,635 %N A053330 Discriminants of real quadratic fields of ERD-type with class number 2. %D A053330 R. A. Mollin, Quadratics, CRC Press, 1996, Appendix A, Table A 9. %H A053330 Sean A. Irvine, <a href="/A053330/b053330.txt">Table of n, a(n) for n = 1..107</a> %K A053330 nonn,fini,full %O A053330 1,1 %A A053330 _N. J. A. Sloane_, Jan 04 2000