The short-interval divisor conjecture for arbitrary fixed scales

Let n1n\geq 1 be an integer, let Dn\mathcal{D}_n be the set of positive divisors of nn, and define

Dn(X,Y)={dDn:XdX+Y}.D_n(X,Y)=\left|\{d\in\mathcal{D}_n:X\leq d\leq X+Y\}\right|.

Fix real numbers θ\theta and ϵ\epsilon satisfying 0<ϵ<θ<10<\epsilon<\theta<1. Short-interval divisor conjecture. There exists a constant kϵ(θ)k_\epsilon(\theta) such that, for every integer n1n\geq 1,

Dn(nθ,nθϵ)kϵ(θ).D_n(n^\theta,n^{\theta-\epsilon})\leq k_\epsilon(\theta).

This proposes a uniform bound for divisors in intervals of length nθϵn^{\theta-\epsilon} beginning at nθn^\theta, simultaneously for every fixed scale 0<θ<10<\theta<1. The supplied text does not state that the conjecture has been proved or disproved.

Sources & referencesView supporting material

Primary source

Patrick Letendre, “Divisors of an Integer in a Short Interval”, arXiv:2503.12146 (2025).

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