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ASU 528 All Soviet Union MO 1990 1990 piles with 1, 2, 3, ... , 1990 stones

Source:

August 14, 2019
pilescombinatoricsalgebragamegame strategy

Problem Statement

Given 19901990 piles of stones, containing 1,2,3,...,19901, 2, 3, ... , 1990 stones. A move is to take an equal number of stones from one or more piles. How many moves are needed to take all the stones?
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