There are finitely many primes p for which the congruence \(8x\equiv 1\pmod{p}\) has no solutions x. Determine the sum of all such p.
Asked and answered here: http://web2.0calc.com/questions/there-are-finitely-many-primes-p-for-which-the-congruence-has-no-solutions-x-determine-the-sum-of-all-such-p#r1
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+249 
