PUMaC 2025 · 代数（B 组） · 第 2 题

PUMaC 2025 — Algebra (Division B) — Problem 2

Max writes an integer on the board. Then every minute, if the number k on the board is even, k 3 k +1 he replaces it with ; otherwise, he replaces it with . If Max writes down the number 1 2 2 after at most 5 minutes, how many different integers could he have started with?

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