olymmath

AIME 1996 Problem 9

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A bored student walks down a hall that contains a row of closed lockers, numbered 11 to 10241024. He opens the locker numbered 1, and then alternates between skipping and opening each locker thereafter. When he reaches the end of the hall, the student turns around and starts back. He opens the first closed locker he encounters, and then alternates between skipping and opening each closed locker thereafter. The student continues wandering back and forth in this manner until every locker is open. What is the number of the last locker he opens?

Dataset text AIME 1983 to 2026. Quoted with source.

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342

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