PFGW Version 3.4.8.64BIT.20110617.Win_Dev [GWNUM 26.6]
Primality testing 21^53753+2 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 5
Running N+1 test using discriminant 11, base 3+sqrt(11)
Calling N-1 BLS with factored part 0.04% and helper 0.00% (0.13% proof)
21^53753+2 is Fermat and Lucas PRP! (540.7765s+0.0027s)

To be completed...