WinPFGW 3.6.0:
2^344444-455 is 3-PRP! (154.4547s+0.0001s)
2^383560-455 is 3-PRP! (182.3833s+0.0085s)
2^318423-487 is 3-PRP! (142.6512s+0.0021s)

To be completed...