Found with PFGW Version 3.7.5

283^20956+20956^283 is 2-PRP! (111.2218s+0.0057s)
283^20956+20956^283 is 3-PRP! (115.1240s+0.0059s)
283^20956+20956^283 is 5-PRP! (109.2603s+0.0051s)
283^20956+20956^283 is 7-PRP! (113.5782s+0.0061s)
283^20956+20956^283 is 11-PRP! (110.8973s+0.0053s)

Primality testing 283^20956+20956^283 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N+1 test using discriminant 19, base 3+sqrt(19)
Calling N-1 BLS with factored part 0.02% and helper 0.00% (0.07% proof)
283^20956+20956^283 is Fermat and Lucas PRP! (754.9363s+0.0063s)

To be completed...