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when toggle format what by license comment
Feb 17, 2020 at 2:10 comment added T. Amdeberhan I will look it up, thanks.
Feb 17, 2020 at 1:30 comment added Fedor Petrov It was proposed by Vietnam to IMO 1977 (for arbitrary integers, not consecutive, Mateusz' proof works for this case too), see longlist of 1977 in any edition of IMO Compendium.
Feb 17, 2020 at 0:54 comment added T. Amdeberhan Nice! It would be good to get any reference.
Feb 17, 2020 at 0:35 history answered Fedor Petrov CC BY-SA 4.0