The probability of a p41 with 904 B1=1e6 curves is ~0.1. Not very rare.
If the c81 splits p41.p41, then I'd say you had something (a 3brilliant split).
Ah. Alas, no...
Using B1=1000000, B2=1045563762, polynomial Dickson(6), sigma=161802477
Step 1 took 1828ms
********** Factor found in step 1: 1766409430355415794746950731
Found probable prime factor of 28 digits: 1766409430355415794746950731
Probable prime cofactor ((10^1218363)/57315926928065111052544509749282072073751)/1766409430355415794746950731 has 53 digits
