I made the following conjecture

CRGreathouse

A better heuristic, though one that still needs some work, suggests that in the limit 23.7% of primes cannot be represented in this form and the remainder can be. This uses a slowly-growing function that converges to a power of the limit form of e.

CRGreathouse Recognitions: Homework Help Science Advisor	A better heuristic, though one that still needs some work, suggests that in the limit 23.7% of primes cannot be represented in this form and the remainder can be. This uses a slowly-growing function that converges to a power of the limit form of e.