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

1,1

Links

Table of n, a(n) for n=1..40.

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.

Sequence in context: A352158 A124177 A260990 * A160078 A066059 A084891

Adjacent sequences: A260988 A260989 A260990 * A260992 A260993 A260994

Keyword

nonn,fini,full

Author

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

Status

approved