PFGW 3.4.0:
2^310289+98327 is 3-PRP! (145.4380s+0.0015s)
2^263032+87517 is 3-PRP! (112.6027s+0.0015s)
2^59975+81143 is 3-PRP! (5.2191s+0.0002s)

To be completed...