Found with PFGW Version 3.7.5

4921^8220-8220^4921 is 2-PRP! (25.8205s+0.0013s)
4921^8220-8220^4921 is 3-PRP! (26.9715s+0.0018s)
4921^8220-8220^4921 is 5-PRP! (26.9059s+0.0013s)
4921^8220-8220^4921 is 7-PRP! (27.1712s+0.0013s)
4921^8220-8220^4921 is 11-PRP! (29.3980s+0.0015s)

Primality testing 4921^8220-8220^4921 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 7
Running N+1 test using discriminant 17, base 8+sqrt(17)
Calling N-1 BLS with factored part 0.02% and helper 0.02% (0.09% proof)
4921^8220-8220^4921 is Fermat and Lucas PRP! (132.2045s+0.0164s)

To be completed...