Found with PFGW Version 3.8.0

643^14912-14912^643 is 2-PRP! (35.9630s+0.0072s)
643^14912-14912^643 is 3-PRP! (36.9301s+0.0082s)
643^14912-14912^643 is 5-PRP! (35.9411s+0.0096s)
643^14912-14912^643 is 7-PRP! (35.3679s+0.0078s)
643^14912-14912^643 is 11-PRP! (38.0574s+0.0078s)

Primality testing 643^14912-14912^643 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N+1 test using discriminant 7, base 1+sqrt(7)
Calling N-1 BLS with factored part 0.02% and helper 0.02% (0.08% proof)
643^14912-14912^643 is Fermat and Lucas PRP! (179.7121s+0.0071s)

To be completed...