list st of Elliptic curves which for which \rho_{2,E} is surjective mod 2 but not mod 4.
List of Elliptic curves which for which \rho_{2,E} is surjective mod 4 but not mod 8.
list st of Elliptic curves which for which \rho_{2,E} is surjective mod 2 but not mod 4.
List of Elliptic curves which for which \rho_{2,E} is surjective mod 4 but not mod 8.