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There don’t seem to be any small ones. Perfect cuboids would be examples, so a proof that no examples exist that are not perfect cuboids would also be very interesting.

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  • $\begingroup$ The perfect cuboid problem is hard enough, a different sounding problem is unlikely to be easier. Indeed, the (non) existence of perfect cuboids is related to the Bombieri-Lang conjecture, so a proof of non-existence (or even just finitely many) perfect cuboids would amount to proving a case of Bombieri-Lang, which would be a huge accomplishment. $\endgroup$ Commented Oct 15, 2023 at 18:29

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