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$$\sum_{p | k} f(p)$$

What does this type of summation actually mean? Can you give me an example(s) with $p=1, 2$?

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$\sum_{p | k} f(p)$ : This notation basically denotes the sum of the functional values $f$ of all the $p$'s which divide a given $k$. $k \in \mathbb{N}$.

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  • $\begingroup$ The $p$ is probably meant to stand for the prime divisors of $k$ - the context will make that clear. $\endgroup$ Jan 17 '16 at 14:30
  • $\begingroup$ @EthanBolker Yeah, you're right. $\endgroup$ Jan 17 '16 at 14:30

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