MathDB
2017 Iran TST2 P2

Source: 2017 Iran TST second exam day1 p2

April 23, 2017
IranIranian TSTnumber theorycombinatorics

Problem Statement

Find the largest number nn that for which there exists nn positive integers such that non of them divides another one, but between every three of them, one divides the sum of the other two.
Proposed by Morteza Saghafian