PPL 076 / 177 permanent IDsPrize Problem Ledger · PPLChecked 2026.07.26
Prize Problem LedgerErdősPPL 076Erdős Problem #711

Permanent problem IDPPL 076

Verified openErdősconjecture

Number theory

Erdős Problem #711

Let f(n,m) be minimal such that in (m,m+f(n,m)) there exist distinct integers a_1,…,a_n such that k∣ a_k for all 1≤ k≤ n. Prove that \max_m f(n,m) ≤ n^(1+o(1)) and that \max_m (f(n,m)-f(n,n))→ ∈fty.

number theory
01

The problem

Let f(n,m) be minimal such that in (m,m+f(n,m)) there exist distinct integers a_1,…,a_n such that k∣ a_k for all 1≤ k≤ n. Prove that \max_m f(n,m) ≤ n^(1+o(1)) and that \max_m (f(n,m)-f(n,n))→ ∈fty.

Open since1980source estimate
Last checked2026.07.26Catalog verification
02

Reward offers

Offer 01₹1000Paul 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.

03

Sources & reading