WinPFGW 3.6.5:
2^343063-1147 is 3-PRP! (157.6864s+0.0002s)
2^170922-2135 is 3-PRP! (40.0471s+0.0024s)
2^198824-2135 is 3-PRP! (60.3403s+0.0022s)
2^197951-2137 is 3-PRP! (60.1965s+0.0023s)

To be completed...