This problem is the first problem from the Haselbauer-Dickheiser Test.

I find this to be one of the harder problems on the test that I haven't solved. To me, the test is weird in the sense that it contains some trivial problems, some well-known math results and some seemingly very hard problems.

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    $\begingroup$ So what would be Rot13(gur eryrinapr bs gur gvyr pbybhef, juvpu nyfb zbir/inel, ohg unir ab cynpr va na nafjre)? $\endgroup$ Oct 7 '19 at 21:48
  • $\begingroup$ The linked site says: "We ask that you do not share your answers in any public forum in order to maintain the integrity of the test". I don't think PSE's explicitly stated policies forbid this sort of thing, but I think maybe they should; I'm going to put it on hold while we (the moderators and possibly the community) discuss this. $\endgroup$
    – Gareth McCaughan
    Oct 8 '19 at 9:58
  • $\begingroup$ (Sorry, should have said lock rather than put on hold.) $\endgroup$
    – Gareth McCaughan
    Oct 8 '19 at 10:00
  • $\begingroup$ Discussion at puzzling.meta.stackexchange.com/questions/6743/… -- general consensus seems to be strongly in favour of not allowing this sort of thing. Sorry, HowDoICSharply! $\endgroup$
    – Gareth McCaughan
    Oct 8 '19 at 15:19
  • $\begingroup$ I'm closing this because it's a puzzle whose maker has asked for answers to it not to be shared around; see this meta question for policy on this. Sorry! $\endgroup$
    – Gareth McCaughan
    Oct 14 '19 at 0:40