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 A051992 #9 Sep 21 2021 15:46:23 %S A051992 85,165,205,221,285,357,365,429,533,629,645,741,957,965,1085,1205, %T A051992 1245,1365,1469,1517,1533,1685,1853,1965,2013,2037,2045,2085,2373, %U A051992 2397,2405,2613,2805,2813,3005,3045,3237,3485,3885,3965,4245,4277 %N A051992 Discriminants of real quadratic fields of ERD-type with class groups of exponent 2 and discriminants of the form D = r^2*k^2+4k, k odd. %C A051992 Excludes discriminants appearing in A051990. %D A051992 R. A. Mollin, Quadratics, CRC Press, 1996, Appendix A, Table A4(3), column D. %H A051992 Georg Fischer, <a href="/A051992/b051992.txt">Table of n, a(n) for n = 1..81</a> %Y A051992 Cf. A051990, A051991, A051993, A051994, A051995, A051996, A051997, A051998. %K A051992 nonn,fini,full %O A051992 1,1 %A A051992 _N. J. A. Sloane_, Jan 04 2000