Generalized repunit (base -160)

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(160^10487+1)/161 is 3-PRP! (47.4188s+1.0468s) (2008-11-09, 13h32m UTC)

Additional results:
(160^10487+1)/161 is 2-PRP! (76.5015s+0.0003s)
(160^10487+1)/161 is 5-PRP! (82.1592s+0.0003s)
(160^10487+1)/161 is 7-PRP! (63.9114s+0.0003s)
(160^10487+1)/161 is 11-PRP! (88.8770s+0.0003s)

To be completed...