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Prime number theorem for arithmetic progressions

Generalizes the Prime Number Theorem to primes in arithmetic progressions.
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The statement of the theorem

The number of primes x\le x in the progression a,a+q,a+2q,a, a+q, a+2q, \dots is asymptotic to 1ϕ(q)xlnx\frac{1}{\phi(q)} \frac{x}{\ln x}.
Source: Wikipedia