Quote:
Can we be certain that all theorized PalPrimes of this nature are actually Prime.

To clarify further:
At this time, we can be certain that only 2 of them are prime. The only known primes in this series are for n=1 and 2, i.e. 10^1+1 and 10^2+1 or simply 11 and 101. All n's have been tested up to n=2^241.
In a synopsis, this means that all 10^n+1 where n<2^24 have effectively been tested for primality, which only required that 24 tests be run, i.e. n=2^0, 2^1, 2^2, 2^3, etc. up to 2^23.
It is unlikely that there are any more primes in this series but there is no way to prove that with current technology and knowledge.