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 A104888 #10 Dec 14 2019 21:34:02 %S A104888 1,2,1,2,2,2,2,1,2,4,1,2,2,2,2,2,1,4,2,2,4,4,1,2,4,1,4,2,2,2,4,1,4,2, %T A104888 2,2,1,2,2,4,2,2,4,2,1,2,2,4,6,4,2,2,2,4,1,4,2,2,4,1 %N A104888 Class number of binary quadratic forms with radicand A005117(n). %C A104888 The fundamental discriminant D and the radicand m (which is squarefree) are related via D=m if m=1 (mod 4) and D=4*m if m=2,3 (mod 4). %D A104888 Hua Loo Keng, Introduction to Number Theory, Springer-Verlag, 1982, pp. 465-472. %H A104888 S. R. Finch, <a href="http://www.people.fas.harvard.edu/~sfinch/">Class number theory</a> %H A104888 Steven R. Finch, <a href="/A000924/a000924.pdf">Class number theory</a> [Cached copy, with permission of the author] %H A104888 Jens Jonasson, <a href="http://www.mai.liu.se/~jejon/">Classes of integral binary quadratic forms</a>, Master's thesis (2001), Appendix B. %Y A104888 Cf. A003646, A087048. %K A104888 nonn %O A104888 2,2 %A A104888 _Steven Finch_, May 03 2005