Is this also why this factor was found by P1 during P+1?
GMPECM 6.2.3 [powered by GMP 4.2.1_MPIR_1.1.1] [P+1]
Input number is (2^2917+1)/3 (878 digits)
Using B1=10000000, B2=93541776130, polynomial x^1, x0=3358300603
Step 1 took 75640ms
Step 2 took 100922ms
[factor found by P1]
********** Factor found in step 2: 19038883797876537274366477800610849
Found probable prime factor of 35 digits: 19038883797876537274366477800610849
Composite cofactor ((2^2917+1)/3)/19038883797876537274366477800610849 has 844 digits
