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 A051984 #7 Sep 21 2021 06:17:38 %S A051984 922,1706,2186,2257,3386,8522,8714,9997,16781,17177,20513,20813,21509, %T A051984 24341,26165,28453,29597,30365,31085,35333,35885,36173,37685,37757, %U A051984 38765,41765,43469,46157,50453,52637,53765,57965,59765,62285,65501,70733,75197,79085,82277,84773,107333,109757,139037,144317 %N A051984 Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 19. %D A051984 R. A. Mollin, Quadratics, CRC Press, 1996, Appendix A, Table A3. %Y A051984 Cf. A051966-A051989. %K A051984 nonn,fini,full %O A051984 1,1 %A A051984 _N. J. A. Sloane_, Jan 04 2000 %E A051984 a(35) and following from _Georg Fischer_, Sep 21 2021