Since 1992, the largest known prime number has been a Mersenne prime. Will the largest known prime number be non-Mersenne at any time before 2030?

This market will resolve YES if it becomes publicly known that a number not of the form 2^n - 1, where n is an integer, is proven to be prime, and is larger than all other publicly known primes at the time, before 2030 begins in any timezone.