olymmath

OBM 2022 Problem 4

    Initially, a natural number nn is written on the blackboard. Then, at each minute, Neymar chooses a divisor d>1d>1 of nn , erases nn , and writes n+dn+d . If the initial number on the board is 20222022 , what is the largest composite number that Neymar will never be able to write on the blackboard?

    Dataset text AI-MO AoPS. Quoted with source.

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