Found with PFGW Version 3.7.5

3661^10520-10520^3661 is 2-PRP! (25.9844s+0.0024s)
3661^10520-10520^3661 is 3-PRP! (25.8111s+0.0023s)
3661^10520-10520^3661 is 5-PRP! (25.9606s+0.0024s)
3661^10520-10520^3661 is 7-PRP! (25.9829s+0.0025s)
3661^10520-10520^3661 is 11-PRP! (25.9689s+0.0023s)

Primality testing 3661^10520-10520^3661 [N-1/N+1, Brillhart-Lehmer-Selfridge]
Running N-1 test using base 3
Running N+1 test using discriminant 11, base 10+sqrt(11)
Calling N-1 BLS with factored part 0.02% and helper 0.00% (0.05% proof)
3661^10520-10520^3661 is Fermat and Lucas PRP! (158.0382s+0.0025s)

To be completed...