Fiori's conjecture on large and small outliers for the least prime

Let ϵ>0\epsilon>0, and let Eϵ(x,y)E_\epsilon(x,y) denote the counting function introduced in the paper for the relevant large outliers of P(n)P(n); the supplied context does not reproduce its definition. Let P(n)P(n) and ϕ(n)\phi(n) be as above, and let \ll denote an upper bound up to a constant. Fiori's outlier conjecture. The paper conjectures the following four assertions: for ϵ>1\epsilon>1 as yy\to\infty,

y1ϵx1ϵ(1ϵ)log(y)Eϵ(x,y)log(x)2x1ϵϵ1;\frac{y^{1-\epsilon}-x^{1-\epsilon}}{(1-\epsilon)\log(y)}\ll |E_\epsilon(x,y)|\ll \frac{\log(x)^2x^{1-\epsilon}}{\epsilon-1};

for ϵ=1\epsilon=1 as yy\to\infty,

loglog(y)Eϵ(x,y)log(y)3log(x)3;\log\log(y)\ll |E_\epsilon(x,y)|\ll \log(y)^3-\log(x)^3;

for ϵ>1\epsilon>1 as yy\to\infty,

y1ϵx1ϵ(1ϵ)log(y)Eϵ(x,y)log(y)2y1ϵlog(x)2x1ϵ1ϵ;\frac{y^{1-\epsilon}-x^{1-\epsilon}}{(1-\epsilon)\log(y)}\ll |E_\epsilon(x,y)|\ll \frac{\log(y)^2y^{1-\epsilon}-\log(x)^2x^{1-\epsilon}}{1-\epsilon};

and

lim supnP(n)ϕ(n)log(n)log(ϕ(n))=2.\limsup_{n\to\infty}\frac{P(n)}{\phi(n)\log(n)\log(\phi(n))}=2.

In particular, the source concludes that EϵE_\epsilon is finite for all ϵ>1\epsilon>1 and infinite for all ϵ1\epsilon\leq1. The supplied statement itself repeats ϵ>1\epsilon>1 in its first and third cases, so that apparent inconsistency is preserved rather than corrected.

Sources & referencesView supporting material

Primary source

Andrew Fiori, “The Least Prime in Arithmetic an Progression”, arXiv:2404.02329 (2024).

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