  The set of terms of an infinite sequence expressed by a recurrence relation
is equal to the set of maximum numbers of all primitive Pythagorean triples
such that the difference between the two non-maximum numbers is 1, which
Cimmino showed. By reference to Cimmino's researches, we show a recurrence
relation for the case where the difference between the two non-maximum numbers
is not 1, but 7.
