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PCOPTRIP

SP20872 PCOPTRIP - Counting Pairwise Coprime Triples

[PCOPTRIP](https://www.luogu.com.cn/problem/SP20872)。 *** $$ \begin{aligned} \sum_{i=1}^{n} \sum_{j=1}^{n} \sum_{k=1}^{n} [(i,j) = 1][(j,k) = 1][(i,k) ......
PCOPTRIP Counting Pairwise Coprime Triples
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