Generalized repunit (base 171)

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(171^12391-1)/170 is 3-PRP! (75.7162s+2.6664s) (2008-11-14, 03h35m UTC)

Additional results:
(171^12391-1)/170 is 2-PRP! (143.7298s+0.0010s)
(171^12391-1)/170 is 5-PRP! (121.1302s+0.0011s)
(171^12391-1)/170 is 7-PRP! (110.3284s+0.0010s)
(171^12391-1)/170 is 11-PRP! (138.4570s+0.0011s)

To be completed...