GMP-ECM version 2d, by P. Zimmermann (Inria), February 1998,
with many contributions from T. Granlund and P. Leyland.
Input number is 2535301200456458802993406410751
recognized factor of 2^101-1
Using special base-2 division (1.332935 faster)
Using B1=3000 and sigma=1127929521
A=567740260643410917931169860757
starting point: x=152139708883318835405429242291
Step 1 took 19451ms for 40290 multiplications
start step 2 with B1=3000, B2=300000.000000, D=388
x=2014865393735825696628765164127
initialization of Step 2 took 5427ms
Step 2 took 21905ms for 28156 multiplications
