Sums of three powerful numbers

Tim Browning, Matteo Verzobio

Let $p,q,r\ge 2$ and consider the Campana orbifold \[ \left( \mathbb{P}^1, \left(1-\tfrac1p\right)[0] +\left(1-\tfrac1q\right)[1] +\left(1-\tfrac1r\right)[\infty] \right). \] Prim…