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 A260991 #16 Aug 10 2015 03:12:28 %S A260991 22,26,28,30,33,34,35,37,38,39,40,42,43,44,45,48,50,51,53,54,55,56,60, %T A260991 61,62,63,64,65,69,75,79,81,83,89,92,94,95,101,119,131 %N A260991 Numbers n such that the modular curve X_0(n) has a bielliptic involution of Atkin-Lehner type. %H A260991 Francesc Bars, <a href="http://dx.doi.org/10.1006/jnth.1998.2343">Bielliptic Modular Curves</a>, Journal of Number Theory, 76 (1999), 154-165. %Y A260991 Same as A260990 except that now 72 is excluded. %Y A260991 Cf. A260992, A260993, A260994. %K A260991 nonn,fini,full %O A260991 1,1 %A A260991 _N. J. A. Sloane_, Aug 08 2015, following a suggestion from _Roger L. Bagula_, Jul 22 2015