Difference between revisions of "2021 USAJMO Problems/Problem 5"
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Revision as of 13:46, 15 April 2021
A finite set 
of positive integers has the property that, for each 
and each positive integer divisor 
of 
, there exists a unique element 
satisfying 
. (The elements and 
could be equal.)
Given this information, find all possible values for the number of elements of .
