Marques–Trojovský conjecture on the Bonse inequality threshold function

From papers

Let pnp_n denote the nn-th prime, let π(x)\pi(x) be the prime-counting function, and for xRx\in\mathbb{R} define

k(n,x)=nπ(n)+π(n)π(logn)xπ(π(n)).k(n,x)=n-\pi(n)+\frac{\pi(n)}{\pi(\log n)}-x\,\pi(\pi(n)).

For xRx\in\mathbb{R}, let Ψ(x)\Psi(x) be the minimum, when it exists, of the integers m8m\geq 8 such that

p1p2pn>pn+1k(n,x)for all nm.p_1p_2\cdots p_n>p_{n+1}^{k(n,x)}\quad\text{for all }n\geq m.

Marques–Trojovský conjecture. The function Ψ(x)\Psi(x) satisfies: (i) Ψ(x)=21\Psi(x)=21 for all x[0.9,1.3]x\in[0.9,1.3]; (ii) Ψ(x)=149\Psi(x)=149 for all x[0.5,0.8]x\in[0.5,0.8]; (iii) Ψ(x)=59,875\Psi(x)=59{,}875 for all x[0.3,0.4]x\in[0.3,0.4]; (iv) Ψ(0.2)=442,414\Psi(0.2)=442{,}414; and (v) Ψ(0.1)=24,154,953\Psi(0.1)=24{,}154{,}953. These values refine the known piecewise-constant behavior of the threshold function and provide explicit numerical information about continuous Bonse-type inequalities; the source does not state whether the conjecture has been resolved.

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Sources & referencesView supporting material

Primary source

Diego Marques and Pavel Trojovsky, “Asymptotic error terms in Bonse-type inequalities”, arXiv:2511.13691 (2025).

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