PUMaC 2009 · 数论（A 组） · 第 6 题
PUMaC 2009 — Number Theory (Division A) — Problem 6
题目详情
- Let s ( m ) denote the sum of the digits of the positive integer m . Find the largest positive integer that has no digits equal to zero and satisfies the equation s ( n ) 2 2 = s ( n )
解析
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Original Explanation
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