Square + 1 = Squarefree
Let $C(n)$ be the number of squarefree integers of the form $x^2 + 1$ such that $1 \le x \le n$.
For example, $C(10) = 9$ and $C(1000) = 895$.
Find $C(123567101113)$.
Let $C(n)$ be the number of squarefree integers of the form $x^2 + 1$ such that $1 \le x \le n$.
For example, $C(10) = 9$ and $C(1000) = 895$.
Find $C(123567101113)$.