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 A051976 #4 Mar 30 2012 16:48:43 %S A051976 265,298,554,794,1322,1658,2218,2509,3242,4181,4682,4685,11413,11773, %T A051976 13085,15685,16085,18485,20285,20765,25565,28013,28685,31037,39797, %U A051976 40157,43733,46637,51917,56117 %N A051976 Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 11. %D A051976 R. A. Mollin, Quadratics, CRC Press, 1996, Appendix A, Table A3. %Y A051976 Cf. A051966-A051989. %K A051976 nonn,fini,full %O A051976 1,1 %A A051976 _N. J. A. Sloane_, Jan 04 2000