Found with PFGW Version 3.6.0

57^21051+56 is 2-PRP! (22.1872s+0.0029s)
57^21051+56 is 3-PRP! (22.9280s+0.0029s)
57^21051+56 is 5-PRP! (22.2812s+0.0028s)
57^21051+56 is 7-PRP! (22.5144s+0.0029s)
57^21051+56 is 11-PRP! (22.0914s+0.0029s)

Primality testing 57^21051+56 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N+1 test using discriminant 17, base 6+sqrt(17)
Calling N+1 BLS with factored part 0.12% and helper 0.02% (0.40% proof)
57^21051+56 is Fermat and Lucas PRP! (154.5786s+0.0043s)

To be completed...