Prove that there are infinitely many prime numbers of the form $6n-1$. I proved that there are infinitely many prime numbers but I couldn't bring it in the form given in the question. While proving it, I was getting $6n+1$ not $6n-1$.
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See the first answer here. – David Mitra Jul 30 '14 at 10:56
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http://math.stackexchange.com/questions/407259/how-do-you-prove-that-there-are-infinitely-many-primes-of-the-form-5-6n – lab bhattacharjee Jul 30 '14 at 10:56
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Oh, thanks. Didn't know the question had already been asked. – Jul 30 '14 at 11:03