Found with PFGW Version 3.7.5

440^7939-7939^440 is 2-PRP! (19.8922s+0.0022s)
440^7939-7939^440 is 3-PRP! (20.6662s+0.0020s)
440^7939-7939^440 is 5-PRP! (19.5620s+0.0018s)
440^7939-7939^440 is 7-PRP! (19.4532s+0.0025s)
440^7939-7939^440 is 11-PRP! (16.8371s+0.0014s)

Primality testing 440^7939-7939^440 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N+1 test using discriminant 19, base 1+sqrt(19)
Calling N-1 BLS with factored part 0.06% and helper 0.06% (0.24% proof)
440^7939-7939^440 is Fermat and Lucas PRP! (96.6848s+0.0039s)

To be completed...