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Aug 9 at 18:06 history edited Emil Jeřábek CC BY-SA 4.0
disallow $i=n$ per comments on the answer
Aug 9 at 17:56 history edited Daniel Asimov CC BY-SA 4.0
result —> question
Aug 9 at 15:20 comment added Aleksei Kulikov "the question of finiteness of solutions is still open" -- if you mean in the sense that nobody cared to do it I would believe you, but I'm pretty sure it is doable with modern number theory tools.
Aug 9 at 15:12 comment added user534817 I louked for equations of the form $x^2=7^y+d$, it seems that for some values of $d$, the question of finiteness of solutions is still open.
Aug 9 at 12:06 answer added Aleksei Kulikov timeline score: 7
Aug 9 at 11:56 comment added Aleksei Kulikov Oh wait, you do allow $i = n$. Then I think I can prove that it is true (and indeed holds for $K = 0$).
Aug 9 at 11:30 comment added Aleksei Kulikov I believe (the negation of) this roughly should mean that one of the Pell equations $x^2-7y^2 = d$ for some $|d| < 11$ should have infinitely many solutions with $y$ being a power of $7$, which might be possible to rule out by the linear forms in logarithms or some more elementary means?
Aug 9 at 11:17 history edited Martin Sleziak CC BY-SA 4.0
a minor typo
S Aug 9 at 11:03 review First questions
Aug 9 at 11:07
S Aug 9 at 11:03 history asked user534817 CC BY-SA 4.0