(In reply to this seems the solution
I just noticed that Wolfram's implicit plot shows almost all values of x show up with y=0 but that is not shown in the numeric values.
And even in the implicit plot it doesn't show values of x between -1/2 and zero with y=0, even though those should be valid pairs (of course not in this puzzle which looks for non-zero integers).
Posted by Charlie
on 2018-06-20 13:36:31