Generalized repunit

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

(142^6133-1)/141 is 3-PRP! (17.2239s+0.3496s) (2008-11-01, 12h09m UTC)

Additional tests:
(142^6133-1)/141 is 2-PRP! (20.9541s+0.0004s)
(142^6133-1)/141 is 5-PRP! (17.6358s+0.0004s)
(142^6133-1)/141 is 7-PRP! (20.1377s+0.0004s)
(142^6133-1)/141 is 11-PRP! (17.8109s+0.0003s)

To be completed...