Difference between revisions of "2011 IMO Shortlist Problems/N5"
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Latest revision as of 06:48, 28 October 2013
Let 
be a function from the set of integers to the set of positive integers. Suppose that, for any two integers 
and 
, the difference 
is divisible by 
. Prove that, for all integers and with 
, the number 
is divisible by 
.
