Quote:
Originally Posted by kruoli
Is it? Oops, sorry for my bad advice.

Consider the information you have before starting ECM versus the information you have after 1000 curves at B1=50k.
Before ECM, you have whatever TF data there is to tell you no factors below e..g 70 bits. There is the usual probability of a factor between 70 bits and 25 digits.
After 1000 curves of ECM, you have ruled out factors less than or equal to 25 digits with 1  1/e^4 probability or better (the 4th power comes from the curve count being 4 times the "expected" number of curves for 25 digit factors).
So, after 1000 curves you are quite sure there isn't a missed factor below 25 digits. But it's not like the 1000th curve is what convinced you each curve you run without finding a factor decreases the chance there is a small factor to be found. It doesn't decrease the chances by much that's why we run hundreds or thousands of curves at each level.