1 Introduction
The problem of studying positive integers n which occur as areas of rational
right triangle was of interest to the Greeks. The congruent number problem
was first discussed systematically by Arab scholars of the tenth century.
By the way recall that a positive integer n is a congruent number if it equals
to the area of right triangle with rational sides.
Since tenth century, some well-known mathematicians have devoted considerable
energy of the congruent number problem. For example Euler showed
that n = 7 is a congruent number with sides of lenght 24
5 ,
35
12 and 337
6