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 A003653 M3781 #10 Dec 29 2021 02:23:50 %S A003653 5,8,13,17,29,37,40,41,53,61,65,73,85,89,97,101,104,109,113,137,145, %T A003653 149,157,173,181,185,193,197,229,232,233,241,257,265,269,277,281,293, %U A003653 296,313,317,328,337,349,353,365,373,389,397,401,409,421,424,433,445,449 %N A003653 Discriminants of quadratic fields whose fundamental unit has norm -1. %D A003653 D. A. Buell, Binary Quadratic Forms. Springer-Verlag, NY, 1989, pp. 224-241. %D A003653 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %Y A003653 Cf. A003658, A349649 (discriminants of real quadratic fields whose fundamental unit has norm 1). %K A003653 nonn %O A003653 1,1 %A A003653 _N. J. A. Sloane_, _Mira Bernstein_