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 A051987 #7 Sep 21 2021 07:10:10 %S A051987 466,763,771,834,1059,1194,1266,1334,1558,1563,1798,1835,1843,1905, %T A051987 1963,1986,2001,2082,2270,2274,2279,2406,2514,2519,2546,2585,2643, %U A051987 2778,2823,2859,2931,2937,2947,3063,3107,3131,3147,3182,3207,3310 %N A051987 Discriminants of real quadratic fields with class number 2 and related continued fraction period length of 22. %D A051987 R. A. Mollin, Quadratics, CRC Press, 1996, Appendix A, Table A3. %H A051987 Georg Fischer, <a href="/A051987/b051987.txt">Table of n, a(n) for n = 1..245</a> %Y A051987 Cf. A051966-A051989. %K A051987 nonn,fini,full %O A051987 1,1 %A A051987 _N. J. A. Sloane_, Jan 04 2000