WinPFGW 3.4.0:
2^398571+60413 is 3-PRP! (306.2031s+0.0003s)
2^242175+74243 is 3-PRP! (88.8377s+0.0018s)
2^231955+74243 is 3-PRP! (84.9249s+0.0017s)

To be completed...