Found with PFGW Version 3.6.0

848^12449-12449^848 is 2-PRP! (56.9192s+0.0025s)
848^12449-12449^848 is 3-PRP! (58.7350s+0.0010s)
848^12449-12449^848 is 5-PRP! (58.4619s+0.0008s)
848^12449-12449^848 is 7-PRP! (58.4452s+0.0008s)
848^12449-12449^848 is 11-PRP! (58.4552s+0.0008s)

Primality testing 848^12449-12449^848 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N+1 test using discriminant 13, base 2+sqrt(13)
Calling N+1 BLS with factored part 0.06% and helper 0.00% (0.17% proof)
848^12449-12449^848 is Fermat and Lucas PRP! (280.5048s+0.0026s)

To be completed...