PPL 074 / 177 permanent IDsPrize Problem Ledger · PPLChecked 2026.07.26
Prize Problem LedgerErdősPPL 074Erdős Problem #708

Permanent problem IDPPL 074

Verified openErdősconjecture

Number theory

Erdős Problem #708

Let g(n) be minimal such that for any A⊆ [2,∈fty)∩ ℕ with | A| =n and any set I of max(A) consecutive integers there exists some B⊆ I with | B|=g(n) such that ∏_(a∈ A) a ∣ ∏_(b∈ B)b. Is it true that g(n) ≤ (2+o(1))n? Or perhaps even g(n)≤ 2n?

number theory
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The problem

Let g(n) be minimal such that for any A⊆ [2,∈fty)∩ ℕ with | A| =n and any set I of max(A) consecutive integers there exists some B⊆ I with | B|=g(n) such that ∏_(a∈ A) a ∣ ∏_(b∈ B)b. Is it true that g(n) ≤ (2+o(1))n? Or perhaps even g(n)≤ 2n?

Open since1959source estimate
Last checked2026.07.26Catalog verification
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Reward offers

Offer 01$100Paul Erdős / Combinatorics Foundation
Documented

A solution must appear in a reputable journal, with documentation that Erdős offered the displayed amount. Claims are administered by the Combinatorics Foundation; erdosproblems.com does not pay awards.

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Sources & reading