Found with PFGW Version 3.5.2

1379^3480-3480^1379 is 2-PRP! (14.1839s+0.0046s)
1379^3480-3480^1379 is 3-PRP! (25.6061s+0.0100s)
1379^3480-3480^1379 is 5-PRP! (27.0526s+0.0121s)
1379^3480-3480^1379 is 7-PRP! (26.6757s+0.0118s)
1379^3480-3480^1379 is 11-PRP! (27.0468s+0.0359s)

Primality testing 1379^3480-3480^1379 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 7
Running N-1 test using base 13
Running N+1 test using discriminant 19, base 6+sqrt(19)
Calling N-1 BLS with factored part 0.12% and helper 0.04% (0.42% proof)
1379^3480-3480^1379 is Fermat and Lucas PRP! (155.0475s+0.0156s)

To be completed...