For primitive binary quadratic forms, the minimal obstruction modulus is a closed formula in the discriminant, and primitive diagonal ternary forms are also handled completely.
Primes of the form x^2 + ny^2 : Fermat, class field theory, and complex multiplication
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The minimal obstruction modulus for quadratic forms
For primitive binary quadratic forms, the minimal obstruction modulus is a closed formula in the discriminant, and primitive diagonal ternary forms are also handled completely.