Square-free values of $n^2+1$

We show that there is a positive constant $c_0$ such that $\sum_{n\le x}μ^2(n^2+1)c_0x+O_{\varepsilon}(x^{7/12+\varepsilon})$ for any fixed $\varepsilon>0$. This improves a result of Estermann [3] from 1931, in which the error term had an exponent 2/3. The proof involves counting rational points near an algebraic curve, which is done via the "determinant method."

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