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Quadratic polynomials 
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#1
Feb913, 05:19 PM

P: 2,464

My teacher said that, No one knows of any quadratic polynomial that produces an infinite amount of primes. I was thinking could we use a polynomial like
[itex] x^2+1 [/itex] and then do a trick similar to Euclids proof of the infinite amount of primes and assume their are only finitely many of them, But this probably wont work. How else could we try to do this. 


#2
Feb913, 05:27 PM

Sci Advisor
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#3
Feb913, 05:46 PM

P: 2,464

2^2+1=5 thats what I mean, are values for x are the naturals



#4
Feb913, 09:56 PM

P: 784

Quadratic polynomials
Okay, just clarifying, are you asking for a quadratic such that there are an infinite number of positive integer inputs for x which produce prime numbers?



#5
Feb913, 10:13 PM

Mentor
P: 18,019

He's talking about this: http://en.wikipedia.org/wiki/Bunyakovsky_conjecture



#6
Feb1013, 08:13 PM

P: 2,464

a couple things I noticed is polynomials of the form [itex] x^2x+1[/itex]
will always produce odd numbers and cant be factored so thats a good start. and the polynomial [itex] x^2+x+1[/itex] produced the same primes as [itex] x^2x+1[/itex] Maybe we could find a set of polynomials that covered a large portion of the odd numbers and then we would know at least one of these produced an infinite amount of primes. 


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