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Let be such that and . Is it true that, for almost all , there exists some with (depending on the choice of signs) such that
converges?
Source: erdosproblems.com/527
An accepted solution exists. The statement is true.
Proved. The site labels the problem PROVED and credits Michelen and Sawhney [MiSa25], whose Theorem 1.1 gives a convergent point almost surely and whose Theorem 1.2 gives a set of convergent points of Hausdorff dimension one. The accepted claim page Michelen and Sawhney 2025 records the result, on the site's acceptance; the paper is a preprint, so no refereed publication is listed. The frontmatter standing derives from the claim page.