WinPFGW 3.7.10:
2^108997-4303 is 3-PRP! (5.7374s+0.0001s)
2^125629-4303 is 3-PRP! (8.1363s+0.0001s)
2^195357-4303 is 3-PRP! (22.1480s+0.0002s)
2^611731-4837 is 3-PRP! (212.7362s+0.0007s)

To be completed...