Found with PFGW Version 3.7.5

140^5843-5843^140 is 2-PRP! (4.3990s+0.0016s)
140^5843-5843^140 is 3-PRP! (4.5518s+0.0014s)
140^5843-5843^140 is 5-PRP! (4.7531s+0.0016s)
140^5843-5843^140 is 7-PRP! (4.2767s+0.0012s)
140^5843-5843^140 is 11-PRP! (4.2880s+0.0013s)

Primality testing 140^5843-5843^140 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N-1 test using base 11
Running N-1 test using base 23
Running N+1 test using discriminant 43, base 3+sqrt(43)
Calling N+1 BLS with factored part 0.16% and helper 0.03% (0.53% proof)
140^5843-5843^140 is Fermat and Lucas PRP! (31.0933s+0.0016s)

To be completed...