Mathematical Proceedings of the Cambridge Philosophical Society

Research Article

The modular curve X0(39) and rational isogeny

M. A. Kenkua1

a1 University of Ibadan

Recently (3) Mazur proved that if N is a prime number such that some elliptic curve E over Q admits a Q-rational isogeny then N is one of 2, 3, 5, 7, 11, 13, 17, 19, 37, 43, 67 or 163.

(Received May 10 1978)