WinPFGW 3.6.5:
2^206755-1579 is 3-PRP! (70.5700s+0.0002s)
2^206464-1649 is 3-PRP! (152.0983s+0.0025s)
2^310924-1709 is 3-PRP! (184.8114s+0.0024s)
2^214938-1781 is 3-PRP! (72.2103s+0.0025s)
2^254238-1841 is 3-PRP! (100.0139s+0.0024s)
2^319194-1841 is 3-PRP! (151.7069s+0.0010s)
2^222520-1907 is 3-PRP! (70.7333s+0.0010s)

To be completed...