Found with PFGW Version 3.7.5

2473^5420-5420^2473 is 2-PRP! (11.2891s+0.0038s)
2473^5420-5420^2473 is 3-PRP! (11.3196s+0.0042s)
2473^5420-5420^2473 is 5-PRP! (11.5279s+0.0043s)
2473^5420-5420^2473 is 7-PRP! (10.9261s+0.0043s)
2473^5420-5420^2473 is 11-PRP! (11.4077s+0.0048s)

Primality testing 2473^5420-5420^2473 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N+1 test using discriminant 11, base 7+sqrt(11)
Calling N+1 BLS with factored part 0.09% and helper 0.01% (0.28% proof)
2473^5420-5420^2473 is Fermat and Lucas PRP! (55.9870s+0.0051s)

To be completed...