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 A329182 #31 May 17 2021 08:50:20 %S A329182 84,96,120,132,160,168,180,192,195,228,240,280,288,312,315,340,352, %T A329182 372,408,435,448,483,520,532,555,595,627,708,715,760,795,928,1012,1435 %N A329182 Negative discriminants with form class group isomorphic to C_2 X C_2 (negated). %C A329182 This sequence is finite and this is the full list. %C A329182 Equivalently, negative discriminants of orders whose class group is isomorphic to C_2 X C_2 (negated). - _Jianing Song_, May 17 2021 %H A329182 Rick L. Shepherd, <a href="http://libres.uncg.edu/ir/uncg/f/Shepherd_uncg_0154M_11099.pdf">Binary quadratic forms and genus theory</a>, Master of Arts Thesis, University of North Carolina at Greensboro, 2013 %o A329182 (PARI) isA329182(d) = (d>0) && ((d%4==0)||(d%4==3)) && quadclassunit(-d)[2]==[2,2] \\ _Jianing Song_, May 17 2021 %Y A329182 Cf. A133675 (negative discriminants with form class group isomorphic to the trivial group), A322710 (isomorphic to C_2), A328825 (isomorphic to C_3), this sequence (isomorphic to C_2 X C_2), A330219 (isomorphic to C_4). %Y A329182 The fundamental terms are listed in A192322. Cf. also A013658. %K A329182 nonn,fini,full %O A329182 1,1 %A A329182 _Jianing Song_, Dec 05 2019