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DK-GEORGMOHR 2025 Problem 3

    Alma and Bertha play the following game. Initially they are standing by a blank board. They take turns writing one of the numbers 11 , 22 , ...... , 20252025 on the board. They may not write a number which is already written on the board. Alma begins. One loses the game by being the first to write a number so that 20252025 divides the product of all the numbers on the board. Which player can find a strategy ensuring she will win?

    Dataset text AI-MO AoPS. Quoted with source.

    Official text: Georg Mohr Contest 2025 official paper, page 1.

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