yoyo@home found a 67-digit factor of C243_M127_k24.
Many thanks!
Code:
Using B1=260000000, B2=3178559884516, polynomial Dickson(30), sigma=0:11839839710820506480
Step 2 took 328547ms
********** Factor found in step 2: 8801385944588148587153855343468735536920009142571596149280058509737
Found prime factor of 67 digits: 8801385944588148587153855343468735536920009142571596149280058509737
Composite cofactor 94410615373218704797201510125651849712559525623382519147033843966374414757318643595714477201887765034604269728700950434464990003242159016268314282962617716190928317011619566657 has 176 digits