Found with PFGW Version 3.8.0

318^15977-15977^318 is 2-PRP! (35.6259s+0.0048s)
318^15977-15977^318 is 3-PRP! (35.3284s+0.0052s)
318^15977-15977^318 is 5-PRP! (34.0567s+0.0043s)
318^15977-15977^318 is 7-PRP! (34.2078s+0.0048s)
318^15977-15977^318 is 11-PRP! (34.6214s+0.0049s)

Primality testing 318^15977-15977^318 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 7
Running N+1 test using discriminant 13, base 1+sqrt(13)
Calling N+1 BLS with factored part 0.03% and helper 0.01% (0.09% proof)
318^15977-15977^318 is Fermat and Lucas PRP! (167.0368s+0.0052s)

To be completed...