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 A034170 #13 Aug 04 2020 01:53:38
%S A034170 5,13,21,33,37,57,85,93,105,133,165,177,253,273,345,357,385,1365
%N A034170 Disjoint discriminants (one form per genus) of type 1.
%C A034170 A subsequence of A000926, A139826, and A232528. - _Andrew Howroyd_, Jun 09 2018
%D A034170 L. E. Dickson, Introduction to the theory of numbers, Dover, NY, 1929.
%D A034170 J. M. Borwein and P. B. Borwein, Pi and the AGM, page 293.
%F A034170 Intersection of A004766 and A139826. - _Andrew Howroyd_, Jun 09 2018
%o A034170 (PARI) ok(n)={n<>1 && n%4==1 && issquarefree(n) && !select(t->t<>2, quadclassunit(-4*n).cyc)} \\ _Andrew Howroyd_, Jun 09 2018
%Y A034170 Cf. A000926, A004766, A034169, A139826, A232528.
%K A034170 nonn,fini,full
%O A034170 1,1
%A A034170 Jonathan Borwein (jborwein(AT)cecm.sfu.ca), Stephen Choi (choi(AT)cecm.sfu.ca)