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2019 IMO Problems/Problem 4

Revision as of 12:46, 15 December 2019 by Flamewavelight (talk | contribs)

Problem

Find all pairs $(k,n)$ of positive integers such that

\[k!=(2^n-1)(2^n-2)(2^n-4)\dots(2^n-2^{n-1}).\]

Solution 1

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