On the set $\{\pi(kn):\ k=1,2,3,\ldots\}$

Lilu Zhao; Zhi-Wei Sun

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On the set \{π(kn):\ k=1,2,3,ldots\}

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arxiv 2004.01080 v1 pith:VGES46CP submitted 2020-04-01 math.NT math.CO

On the set \{π(kn):\ k=1,2,3,ldots\}

Zhi-Wei Sun , Lilu Zhao This is my paper

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An open conjecture of Z.-W. Sun states that for any integer $n>1$ there is a positive integer $k\le n$ such that $\pi(kn)$ is prime, where $\pi(x)$ denotes the number of primes not exceeding $x$. In this paper, we show that for any positive integer $n$ the set $\{\pi(kn):\ k=1,2,3,\ldots\}$ contains infinitely many $P_2$-numbers which are products of at most two primes. We also prove that under the Bateman--Horn conjecture the set $\{\pi(4k):\ k=1,2,3,\ldots\}$ contains infinitely many primes.

On the set \{π(kn):\ k=1,2,3,ldots\}

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