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A Markoff triple $(a,b,c)$ is a solution in positive integers to the equation $$ a^2+b^2+c^2=3abc. $$ Frobenius famously conjectured that a given integer $c$ may appear at most once as the largest coordinate of a Markoff triple $(a,b,c)$, a conjecture often referred to as the Unicity Conjecture. This conjecture appears (I've been told) in the paper

G. Frobenius, Über die Markoffschen Zahlen, S. B. Preuss Akad. Wiss., Berlin, 1913, pp. 458–487.

I was wondering if anyone knows where to find a copy of this paper on the web; or if you have a copy, would it be possible for you to send me a PDF? It's long out of copyright, so that shouldn't be an issue. I tried a general web search, and Google Scholar, but no success. [I'd be even more appreciative of a translation into English, since my German reading skills are rusty; but probably that's too much to hope for.]

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I found Frobenius's 1913 publication in the Biodiversity Heritage Library. (Somehow Google Scholar does not index it.) You can view the paper online and download the pdf by submitting an email address.

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    $\begingroup$ Fantastic. Thank you. Not only do they send the page images, but if requested, they also do an OCR scan and send that, too. Admittedly OCR scans of math leave something to be desired, but I can take text paragraphs and put them into GoogleTranslate, which is helpful. $\endgroup$
    – Joe Silverman
    Commented Sep 27, 2020 at 22:33

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