WinPFGW 3.6.0:
2^218680-719 is 3-PRP! (67.4945s+0.0001s)
2^279388-719 is 3-PRP! (104.0289s+0.0024s)
2^385969-823 is 3-PRP! (183.8153s+0.0021s)
2^348531-949 is 3-PRP! (166.1651s+0.0024s)

To be completed...