Difference between revisions of "1999 OIM Problems/Problem 4"
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Latest revision as of 16:06, 13 December 2023
Problem
Let 
be an integer greater than 10 such that each of its digits belongs to the set {1, 3, 7, 9}. Show that has a prime factor greater than or equal to 11.
~translated into English by Tomas Diaz. ~orders@tomasdiaz.com
Solution
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