PFGW Fermat Prp b=3,7 and BLS test :
PFGW Version 20040817.Win_Dev (Beta 'caveat utilitor') [FFT v23.8]
Primality testing 2^301683-301683^2 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 17
Running N+1 test using discriminant 23, base 1+sqrt(23)
2^301683-301683^2 is Fermat and Lucas PRP! (10946.6753s+0.0039s)

To be completed...