Joint-distribution independence conjecture for consecutive values of Ω\Omega

Let Ω(n)\Omega(n) denote the total number of prime factors of nn, counted with multiplicity, let [N]={1,,N}[N]=\{1,\ldots,N\}, and for a finite set SS write ExSf(x)=S1xSf(x)\mathbb{E}_{x\in S}f(x)=|S|^{-1}\sum_{x\in S}f(x). Joint-distribution independence conjecture. For any kNk\in\mathbb{N} and any bounded function a ⁣:NkCa\colon\mathbb{N}^k\to\mathbb{C},

En[N]a(Ω(n),Ω(n+1),,Ω(n+k1))=E(n1,,nk)[N]ka(Ω(n1),,Ω(nk))+oN(1).\mathbb{E}_{n\in[N]}a\bigl(\Omega(n),\Omega(n+1),\ldots,\Omega(n+k-1)\bigr)=\mathbb{E}_{(n_1,\ldots,n_k)\in[N]^k}a\bigl(\Omega(n_1),\ldots,\Omega(n_k)\bigr)+o_{N\to\infty}(1).

This is presented as an equivalent formulation of the almost-prime independence conjecture and expresses asymptotic independence of the joint distribution of consecutive values of Ω\Omega. The paper states that the equivalent formulation remains open.

Sources & referencesView supporting material

Primary source

Dimitrios Charamaras and Florian K. Richter, “Asymptotic independence of Ω(n) and Ω(n+1) along logarithmic averages”, arXiv:2412.17583 (2025).

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