PFGW Version 20041001.Win_Stable (v1.2 RC1b) [FFT v23.8]

Primality testing 10^28350+1593583
[N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 5
Running N+1 test using discriminant 11, base 2+sqrt(11)
10^28350+1593583 is Fermat and Lucas PRP!

Also, 1593583 is the largest known revrepfigit prime (see Mathworld entry on Keith Numbers for details).

To be completed...