WinPFGW 3.7.10:
2^254716-3779 is 3-PRP! (33.6129s+0.0005s)
2^265212-3779 is 3-PRP! (38.2990s+0.0008s)
2^261174-3911 is 3-PRP! (37.6381s+0.0008s)
2^274686-3911 is 3-PRP! (45.6422s+0.0008s)
2^357058-3911 is 3-PRP! (75.4150s+0.0009s)
2^370610-3911 is 3-PRP! (78.4141s+0.0010s)
2^304278-4001 is 3-PRP! (52.8427s+0.0010s)
2^545668-4019 is 3-PRP! (195.7667s+0.0008s)

To be completed...