KöMaL 2013 K393
Consider a product whose factors are all 7. Is it possible that the result is a 45-digit number in which the digits 1, 2, 3, 4, 5, 6, 7, 8, 9 occur 9, 8, 7, 6, 5, 4, 3, 2, 1 times, respectively?
Official text KöMaL. Quoted with source.
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