2019 IMO Problems/Problem 4
Revision as of 09:20, 19 July 2019 by Toinfinity (talk | contribs) (Created page with "Find all pairs <math>(k,n)</math> of positive integers such that <cmath>k!=(2^n-1)(2^n-2)(2^n-4)\dots(2^n-2^{n-1}).</cmath>")
Find all pairs 
of positive integers such that
![\[k!=(2^n-1)(2^n-2)(2^n-4)\dots(2^n-2^{n-1}).\]](http://latex.artofproblemsolving.com/7/c/a/7ca521b92d40def7f320702893c01502439174e8.png)
