Erdős Problem 793

### What is the conjecture

https://www.erdosproblems.com/793

Let $F(n)$ be the maximum possible size of a subset $A\subseteq\\{1,\ldots,N\\}$ such that $a\nmid bc$ whenever $a,b,c\in A$ with $a\neq b$ and $a\neq c$. Is there a constant $c$ such that
$$F(n)=\pi(n)+(c+o(1))n^{2/3}(\log n)^{-2}?$$

Status: open

### Choose either option
- [ ] I plan on working on this conjecture
- [x] This issue is up for grabs: I would like to see this conjecture added by somebody else