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Aug 24, 2022 at 6:48 comment added TravorLZH From the definition of logarithmic integral, it is natural to believe $\sum_{p\le x}f(p)\approx\int_2^x{f(t)\over\log t}\mathrm dt$ when $f(x)$ is continuously differentiable and satisfies certain other good properties.
Aug 19, 2022 at 22:55 comment added Steven Clark Did you mean $A(x)=\sum\limits_{k\leq x}f(k)(\pi(k)-\pi(k-1))$?
Aug 19, 2022 at 14:08 comment added davidlowryduda If $f$ is reasonable (e.g. differentiable), then you can integrate by parts and try to use the prime number theorem to study the other side. Depending on $f$, this may or may not be sufficient to get a good understanding of $A(x)$. Does that make sense?
Aug 19, 2022 at 13:16 review Close votes
Sep 3, 2022 at 3:02
S Aug 19, 2022 at 12:37 review First questions
Aug 19, 2022 at 12:54
S Aug 19, 2022 at 12:37 history asked RAHUL CC BY-SA 4.0