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Congruence condition for two to be a quadratic residue
Fact about Quadratic residue + , Quadratic nonresidue +
Modification date
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Dirichlet's theorem for modulus eight + , Dirichlet's theorem for modulus four + , Every integer that is not a perfect square is a quadratic nonresidue for infinitely many primes + , Prime divisor of Fermat number is congruent to one modulo large power of two + , Product of successive primes in Cunningham chain of the second kind satisfying congruence conditions is Poulet number + , Safe prime has plus or minus two as a primitive root + Uses
 

 

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