Generalized repunit

Open WinPFGW Version 1.30 - PFGW Version 1.2.0 for Windows [FFT v23.8]

(129^8447-1)/128 is 3-PRP! (71.1009s+1.2645s) (2008-11-01, 23h23m UTC)

Additional tests:
(129^8447-1)/128 is 2-PRP! (38.0436s+0.0006s)
(129^8447-1)/128 is 5-PRP! (37.1389s+0.0006s)
(129^8447-1)/128 is 7-PRP! (40.2024s+0.0006s)
(129^8447-1)/128 is 11-PRP! (37.5698s+0.0006s)

To be completed...