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Set of all primes $p$ that split in $\mathbb{Q}\left(\sqrt{-k}\right)$
Let $k$ be a squarefree positive integer. We know that a prime $p$ splits in $K=\mathbb{Q}(\sqrt{-k})$ if and only if $-k$ is a quadratic residue mod $p$.
My question is: can we explicitly determine ...
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