2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/56492The fourth, missing example of an exactly solvable complex potential with PT symmetry V(x) = [V(-x)]^* defined on a bent contour and leading, at the real energies, to the Jacobi polynomial wave functions is found in a generalized Hulthen interaction.Latex file, 9 pagesMathematical Physics81Q05text