The polynomial Erdős–Wagstaff density conjecture

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Let P(x)P(x) be a polynomial, and let dˉ\bar{\mathbf{d}} denote upper density. For a positive integer TT, consider the set of integers nn for which p−1p-1 divides P(n)P(n) for some prime p>Tp>T. Polynomial Erdős–Wagstaff conjecture. For all ϵ>0\epsilon>0 and all polynomials P(x)P(x), there exists a T=T(ϵ,P)T=T(\epsilon,P) such that

dˉ({n:p−1∣P(n) for some prime p>T})<ϵ.\bar{\mathbf{d}}\bigl(\{n: p-1\mid P(n)\text{ for some prime }p>T\}\bigr)<\epsilon.

This is proposed as the polynomial analogue of the Erdős–Wagstaff result used to prove that the range of Euler's φ\varphi-function has density zero. The statement is presented as a needed variant for extending that argument to polynomial values and is not resolved in the supplied text.

References

Primary source

Noah Lebowitz-Lockard, “Irreducible quadratic polynomials and Euler's function”, arXiv:1810.12990 (2018).

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