Found with PFGW Version 3.6.0

728^4923-4923^728 is 2-PRP! (9.3390s+0.0033s)
728^4923-4923^728 is 3-PRP! (9.6792s+0.0046s)
728^4923-4923^728 is 5-PRP! (9.6069s+0.0031s)
728^4923-4923^728 is 7-PRP! (9.6234s+0.0047s)
728^4923-4923^728 is 11-PRP! (9.6207s+0.0048s)

Primality testing 728^4923-4923^728 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 11
Running N+1 test using discriminant 17, base 1+sqrt(17)
Calling N-1 BLS with factored part 0.06% and helper 0.04% (0.22% proof)
728^4923-4923^728 is Fermat and Lucas PRP! (45.1870s+0.0016s)

To be completed...