A260991 Numbers n such that the modular curve X_0(n) has a bielliptic involution of Atkin-Lehner type.

22, 26, 28, 30, 33, 34, 35, 37, 38, 39, 40, 42, 43, 44, 45, 48, 50, 51, 53, 54, 55, 56, 60, 61, 62, 63, 64, 65, 69, 75, 79, 81, 83, 89, 92, 94, 95, 101, 119, 131

Offset: 1

Author

N. J. A. Sloane, Aug 08 2015, following a suggestion from Roger L. Bagula, Jul 22 2015

Keywords

• nonn
• fini
• full

Links

• Francesc Bars, Bielliptic Modular Curves, Journal of Number Theory, 76 (1999), 154-165.

Crossrefs

Same as A260990 except that now 72 is excluded.

Cf. A260992, A260993, A260994.