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Jul 18, 2018 at 2:42 comment added Zhi-Wei Sun In the cited arXiv paper, I showed that for any integer $x > 1$, the sets $\{x^n+n:\ n=1,2,3,\ldots\}$ and $\{x^n-n:\ n=1,2,3,\ldots\}$ contain a complete system of residues modulo any positive integer. So I consider numbers of the form $x^n\pm n$ interesting and ask a question similar to Catalan's conjecture.
Jul 17, 2018 at 7:50 comment added Vesselin Dimitrov Finiteness of solutions follows of course from the $abc$ conjecture. They look completely unassailable to me; Catalan is very special, and just changing the ``$1$'' to $2$ or $n$ or $m$ leads to equations apparently beyond all known techniques.
Jul 17, 2018 at 5:12 comment added Dmitry Vaintrob Why do you think this diophantine equation is interesting?
Jul 17, 2018 at 4:55 history asked Zhi-Wei Sun CC BY-SA 4.0