diophantine equation Definition and 1 Threads

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    I Infinitely many primes of the form p² + nq² -- really?

    Hi, after stumbling about We show that there are infinitely many primes of the form p² + nq² with both p and q prime ... I found that using n=4 the formula gives 205 and 221 with p=3, q=7 and p=5, q=7 respectively. So, how to understand that?
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