Abstract
Generally, integer solutions to equations of three or more variables are given in various parametric forms (see [3]). In [2] it is proved that the diophantine equation x + y + z = xyz has solutions in the units
of the quadratic field Q(
√
d) if and only if d = −1,2, or 5 and in
these cases all solutions are also given. The problem of finding all of its solutions remains open. In this paper we will construct different families of infinite positive integer solutions to the equation:
(x + y + z)2 = xyz(1)
We will indicate a general method of generating such families of solutions by using the theory of Pell‘s equations. It seems that the problem of finding all solutions to equation (1) is a difficult one and it is still open.