The reason this PRP s form is so strange is that it is based on "mock-rational numbers" -- those that exhibit patterns in their digits. Its decimal expansion consists of many repeating single digits separated by “random” strings.

Resuming input file MOCK6.txt at line 1
[N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 2
Running N-1 test using base 3
Running N+1 test using discriminant 13, base 2+sqrt(13)
333333333333333333....000000000000006547 is Fermat and Lucas PRP!

To be completed...