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OIM 2022 Problem 2

    Let S={13,133,⋯ }S=\{13, 133, \cdots\} be the set of the positive integers of the form 133⋯3133 \cdots 3 . Consider a horizontal row of 20222022 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 20222022 -digit number NN . Borja wins if NN is divisible by a number in SS , 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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