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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) + 12x = 4 mod(p).

 Sep 18, 2021
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There are only 3 small primes:

 

2, 3, 5 ==2 + 3 = 5 ==10 -their sum

 Sep 19, 2021

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