I'm looking for a imaginary quadratic number field in which $17$ is a prime element. For example, in $\Bbb{Q}(i)$, $17$ is not prime element. $\Bbb{Q}(\sqrt{-17})$ was in vain.
Once imaginary quadratic field is given, I can check whether $17$ is a prime element or not by calculating residue ring, but I cannot find what the imaginary quadratic field is.
Thank you in advance.