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 (1.310293 faster)
Using B1=3000 and sigma=391099952
A=1896830125669475181888923096339
starting point: x=606998214192944374591362347558
Step 1 took 29164ms for 40290 multiplications
start step 2 with B1=3000, B2=300000.000000, D=388
x=997064292665923618460282148749
initialization of Step 2 took 8408ms
last interval is 3493.000000..4269.000000
********** Factor found during step 2: 7432339208719