(In reply to Counterexample
by Steve Herman)
Even in the positive reals: 4+pi, 4+2pi,.... I rather doubt there is another square in the sequence.
A different matter if a and d are both in the positive integers.
Update: it's also true if a and d are in the positive rationals.
Edited on March 28, 2018, 9:30 am
Posted by broll
on 2018-03-28 08:52:00