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Feb 2, 2021 at 2:39 comment added Tony419 I see, I'll try this approach. Thanks a lot, Will!
Feb 2, 2021 at 2:34 comment added Will Sawin The best approach might be to consider the real solution set, which I think is always the union of two regions, and use standard results to count lattice points in regions. In the limit as $a,b \to \infty$, unless $a,b$ are very close together, the functions $m^2+n^2$ and $m^3+n^3$ will behave approximately linearly near $a,b$ and these shapes will regions will converge to long, thin rectangles. A bound will then be the area of the rectangle or its diameter, whichever is larger. But getting explicit estimates might prove tricky...
Feb 1, 2021 at 1:52 history asked Tony419 CC BY-SA 4.0