PUMaC 2008 · 代数（B 组） · 第 3 题
PUMaC 2008 — Algebra (Division B) — Problem 3
题目详情
- (3 points) Given the sequence 1, 2, 1, 2, 2, 1, 2, 2, 2, 1, 2, 2, 2, 2, 1, . . . , find n such that the sum of the first n terms is 2008 or 2009. 3 x +1
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