Generalized repunit (base -172)

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

(172^5417+1)/173 is 3-PRP! (11.0050s+0.3056s) (2008-11-15, 21h04m UTC)

Additional results:
(172^5417+1)/173 is 2-PRP! (20.1977s+0.0003s)
(172^5417+1)/173 is 5-PRP! (17.2807s+0.0003s)
(172^5417+1)/173 is 7-PRP! (16.0489s+0.0003s)
(172^5417+1)/173 is 11-PRP! (18.4894s+0.0003s)

To be completed...