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Determine the sum of all prime numbers p for which there exists no integer solution in x to the congruence

3(6x+1) == 4 mod(p).

 Aug 2, 2018
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By simple inspection, it turns out that p=2 and p=3, for which there is no integer solution in x for the congruence 3(6x+1) == 4 mod(p).

Their sum = 2 + 3 = 5

 Aug 2, 2018
edited by Guest  Aug 2, 2018

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