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Primesmedium
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Dirichlet's Theorem states that there are infinitely many primes in any arithmetic progression a,a+d,a+2d,…a, a+d, a+2d, \dotsa,a+d,a+2d,… if gcd⁡(a,d)=1\gcd(a, d) = 1gcd(a,d)=1. Which of the following arithmetic progressions contains exactly ONE prime number?