Open sx349 opened 10 months ago
https://pe-cn.github.io/864/
Problem 864 Square + 1 = SquarefreeLet $C(n)$ 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)
https://pe-cn.github.io/864/
Problem 864 Square + 1 = SquarefreeLet $C(n)$ 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)