OIM 2022 Problem 2
Let be the set of the positive integers of the form . Consider a horizontal row of cells. Ana and Borja play a game: they alternatively write a digit on the leftmost empty cell, starting with Ana. When the row is filled, the digits are read from left to right to obtain a -digit number . Borja wins if is divisible by a number in , otherwise Ana wins. Find which player has a winning strategy and describe it.
Dataset text AI-MO AoPS. Quoted with source.
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