MEMO 2010 pojedinačno problem 2
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Avg: 5,3 All positive divisors of a positive integer are written on a blackboard. Two players and play the following game taking alternate moves. In the firt move, the player erases . If the last erased number is , then the next player erases either a divisor of or a multiple of . The player who cannot make a move loses. Determine all numbers for which can win independently of the moves of .
Izvor: Srednjoeuropska matematička olimpijada 2010, pojedinačno natjecanje, problem 2