The reason the form of this PRP is so strange is that it is based on "mock-rational numbers" -- those that exhibit patterns in their digits. Its decimal expansion has repeating 370s and 481s along with single repeating digits and other patterns, separated by “random” strings of digits.

Resuming input file MOCK2.TXT at line 2
[N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 5
Running N+1 test using discriminant 17, base 1+sqrt(17)
Running N+1 test using discriminant 17, base 2+sqrt(17)
Running N+1 test using discriminant 17, base 3+sqrt(17)
3703703703703703....0000000000025087 is Fermat and Lucas PRP!

To be completed...