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Z. Rudnick and P. Sarnak have proved that the pair correlation for thefractional parts of $n^2 \alpha$ is Poissonian for almost all $\alpha$.However, they were not able to find a specific $\alpha$ for which it holds. Weshow that the problem is related to the problem of determining the number of$(a,b,r) \in \N^3$ such that $a \le M$, $b \le N$, $r \le K$ and $p ab \equiv r(q)$ for $p$ and $q$ coprime. With suitable assumptions on the relative size of$K$, $M$, $N$ and $q$ one should expect there to be $KMN/q$ such triplesasymptotically and we will show that this holds on average.

Divisor problems and the pair correlation for the fractional parts of $n^2\alpha$