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 A052478 #4 Mar 30 2012 16:48:44 %S A052478 221,273,312,364,377,429,481,533,572,728,741,949,988,1001,1144,1157, %T A052478 1196,1209,1261,1417,1469,1612,1729,1781,1833,1976 %N A052478 Discriminants of real quadratic number fields with class number 2 such that Hilbert class field has splitting field Q(sqrt(13)). %D A052478 H. Cohen, Advanced Topics in Computational Number Theory, Springer, 2000, pp. 534-535. %Y A052478 Cf. A035120, A003656, A052475-... %K A052478 nonn,nice %O A052478 1,1 %A A052478 _N. J. A. Sloane_, Mar 15 2000