WinPFGW 3.6.0:
2^251780-1289 is 3-PRP! (94.9316s+0.0022s)
2^296037-1411 is 3-PRP! (149.0301s+0.0020s)
2^361873-1411 is 3-PRP! (174.0762s+0.0022s)
2^216154-1421 is 3-PRP! (67.8017s+0.0029s)
2^252418-1421 is 3-PRP! (95.3457s+0.0022s)
2^318946-1421 is 3-PRP! (144.1837s+0.0020s)
2^388888-1529 is 3-PRP! (254.7229s+0.0021s)

To be completed...