A260990 Numbers n such that the modular curve X_0(n) is bielliptic.

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, 72, 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

References

• J. S. Balakrishnan, B. Mazur, and N. Dogra, Ogg's torsion conjecture: fifty years later, Bull. Amer. Math. Soc., 62:2 (2025), 235-268.

Links

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

Crossrefs

Cf. A260991, A260992, A260993, A260994.