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If p is a prime number, for how many values of p is p^2 +21p - 1 also prime?
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If p is a prime number, for how many values of p is p^2 +21p - 1 also prime?

User Alvaro Lorente
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ugherw;guih4g;/mr5t;
./erbgjkwehjbf.aeh bnjlnbwef erl,jh
User BcWeb
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