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Let be the smallest such that all prime factors of are . Estimate .
Source: erdosproblems.com/1095
No claim settles this problem.
Open on the site (OPEN; page last edited 21 June 2026). The site's remarks credit the bounds to Ecklund, Erdős and Selfridge, and the lower-bound record to Konyagin. Ecklund, Erdős and Selfridge write that "seems to hold for all " (their conjecture on p. 649); their own table gives at , and , so the question is whether for all large . The standing in the frontmatter derives from the claim pages: the only claim is the pending partial claim Yang's eventual lcm bound, a manuscript of September 2026 with a Lean development, produced with GPT-6 Astra and GPT-5.6 Sol, proving for every sufficiently large ; it does not estimate , no reviewer has accepted it, this corpus has not built its Lean, and the site's label is unchanged, so the problem stands open with a pending partial claim.