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a+b|ab

Source:

May 26, 2009
number theoryrelatively primecombinatorics unsolvedcombinatorics

Problem Statement

Find the smallest positive integer K K such that every K K-element subset of {1,2,...,50} \{1,2,...,50 \} contains two distinct elements a,b a,b such that a\plus{}b divides ab ab.
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