February 26th, 2009, 06:53 PM  #1 
Senior Member Joined: Nov 2007 Posts: 258 Thanks: 0  Yet (another) conjecture
I conjecture that, given a polynomial , irreducible over Z and having coprime coefficients, then there are infinitely many primes of the form . This is an obvious generalization of Dirichlet's theorem on arithmetic progression, and also includes other conjectures concerning primes (such as "there are infinitely many primes of the form "). Is there any evidence that this conjecture might hold? I'd be willing to bet $10 it's true. I know there might not be much interest in such general statements but sometimes the general case is easier to prove than a perticular case (such as ). 
February 26th, 2009, 07:39 PM  #2 
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 932 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: Yet (another) conjecture
Good conjecture, but Hardy & Littlewood beat you to it by 86 years. It's still open.

February 26th, 2009, 08:04 PM  #3  
Senior Member Joined: Nov 2007 Posts: 258 Thanks: 0  Re: Yet (another) conjecture Quote:
I'll raise it to $100 then. Does there appear to be a good approximation of the density of the primes of a given polynomial form? (Such as 1 /(phi(b) log n) for the progression a+bk, if I'm not mistaken).  
February 27th, 2009, 03:56 AM  #4  
Senior Member Joined: Sep 2008 Posts: 150 Thanks: 5  Re: Yet (another) conjecture Quote:
Your polynomial has to be irreducible in the ring of numerical polynomials, that is polynomials with rational coefficients that take only integer values on the integers. Of course this ring contains , but it is bigger. With your assumption it is not difficult to construct counterexamples: The values of are all divisible by 2 likewise the values of are all divisible by 3.  
February 27th, 2009, 07:27 AM  #5  
Global Moderator Joined: Nov 2006 From: UTC 5 Posts: 16,046 Thanks: 932 Math Focus: Number theory, computational mathematics, combinatorics, FOM, symbolic logic, TCS, algorithms  Re: Yet (another) conjecture Quote:
Let with The density is where e is 1/2 when a + b is odd and 1 when a + b is even, Li is the logarithmic integral, and where the products run over odd primes p and is the Legendre symbol.  

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