A260991 - OEIS

%I #16 Aug 10 2015 03:12:28

%S 22,26,28,30,33,34,35,37,38,39,40,42,43,44,45,48,50,51,53,54,55,56,60,

%T 61,62,63,64,65,69,75,79,81,83,89,92,94,95,101,119,131

%N Numbers n such that the modular curve X_0(n) has a bielliptic involution of Atkin-Lehner type.

%H 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 Same as A260990 except that now 72 is excluded.

%Y Cf. A260992, A260993, A260994.

%K nonn,fini,full

%O 1,1

%A _N. J. A. Sloane_, Aug 08 2015, following a suggestion from _Roger L. Bagula_, Jul 22 2015