The decimal expansion of this expression is a tetradic palindrome of form x*10^y+z.

3-PRP, 101-PRP, 7-PRP, 203-PRP per PFGW
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Primality testing
[...the number...]
[N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 7
Running N+1 test using discriminant 17, base 10+sqrt(17)
Calling N-1 BLS with factored part 0.04% and helper 0.00% (0.13% proof)
[...the number...]
is Fermat and Lucas PRP! (303.3142s+0.0360s)

To be completed...