has positive rank. Congruent numbers, scaled by
squares of integers, retain the property of being
congruent and their associated scaled elliptic
curves have the same rank. Tables of congruent
numbers can be found in the papers of Noda
and Wada [8] and Nemenzo [7]. Chahal [4] has
proved that there exist infinitely many congruent
numbers in each congruence class modulo 8. In
other words, there exist infinitely many positive
integers n in each congruence class modulo 8
such that the curve given in (1) has rank at
least 1. Bennett [2] showed that there exist infinitely
many congruent numbers in any congruence
class modulo the integer m > 1. The purpose of
this paper is to prove a related result where
the ranks of the congruent number curves are
shown to be at least 2. We prove the following
theorem.