It seems to me that my answer at
deserves to become a little paper; everyone I mention it to is surprised by the result, and I doubt that it's well known. The paper I have in mind would be a considerably cleaned up version of what appears there.
Q: What legalities, protocols, and bits of etiquette are involved in publishing an answer to a MSE question?
In particular, assuming that such a publication is not simply unacceptable: Presumably I'd cite MSE as the source of the conjecture. I imagine there's a standard way to give such a citation, that I can find when I get around to looking for it. In particular squared: Would I cite the author as user228168 or is there a way to find his/her real name for this purpose?