A260993 Numbers n such that the modular curve X_0(n) contains infinitely many rational points of degree 2.

22, 23, 26, 28, 29, 30, 31, 33, 35, 37, 39, 40, 41, 43, 46, 47, 48, 50, 53, 59, 61, 65, 71, 79, 83, 89, 101, 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

Cf. A260990, A260991, A260992, A260994.