GMP-ECM 7.0.4-dev [configured with GMP 6.1.1, --enable-asm-redc] [ECM] Input number is Phi(16168,10)/2589644191044553/6559070566375577 (7697 digits) Using B1=250000, B2=183032866, polynomial Dickson(3), sigma=1:2811823498 Step 1 took 531012ms Step 2 took 105768ms ********** Factor found in step 2: 2867443649364054475343041995521 Found prime factor of 31 digits: 2867443649364054475343041995521 Composite cofactor (Phi(16168,10)/2589644191044553/6559070566375577)/2867443649364054475343041995521 has 7667 digits