WinPFGW 3.8.3:
2^219903-4615 is 3-PRP! (21.9992s+0.0027s)
2^321237-4615 is 3-PRP! (46.6363s+0.0029s)
2^218399-4627 is 3-PRP! (21.9569s+0.0007s)
2^370695-4627 is 3-PRP! (63.7205s+0.0028s)
2^395055-4627 is 3-PRP! (74.7572s+0.0033s)
2^320816-4685 is 3-PRP! (46.5574s+0.0008s)
2^374640-4685 is 3-PRP! (61.7328s+0.0007s)
2^275926-4691 is 3-PRP! (36.8346s+0.0031s)
2^324958-4691 is 3-PRP! (47.1806s+0.0032s)
2^227009-4693 is 3-PRP! (24.4538s+0.0008s)
2^266413-4693 is 3-PRP! (35.9055s+0.0028s)
2^251842-4715 is 3-PRP! (27.0484s+0.0028s)
2^287482-4715 is 3-PRP! (38.3435s+0.0004s)
2^284183-4747 is 3-PRP! (37.9056s+0.0008s)
2^243281-4843 is 3-PRP! (26.2443s+0.0031s)
2^287902-4961 is 3-PRP! (38.6350s+0.0027s)

To be completed...