View Single Post
Old 2020-11-21, 16:06   #507
Alfred
 
Alfred's Avatar
 
May 2013
Germany

5316 Posts
Default p54 with ecm and B1 = 3e6

Caught this p54 while searching for a brilliant 199-digit number.

Code:
Input number is 9999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999992027 (199 digits)
Using B1=3000000-3000000, B2=5706890290, polynomial Dickson(6), sigma=3:1452677002
Step 1 took 0ms
Step 2 took 2813ms
********** Factor found in step 2: 423160190219167918418888831508389397512846550243914177
Found prime factor of 54 digits: 423160190219167918418888831508389397512846550243914177
Prime cofactor 23631712602314236460375363605669880057528256019179586483958332029245798546518655036308640681338947369725232833261868840557864887635516265827697051 has 146 digits
Alfred is offline   Reply With Quote