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
DocumentedA 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.