Here: https://xtools.wmflabs.org/articleinfo/en.wikipedia.org/Sieve%20of%20Eratosthenes
XTools version: 3.1.23-d4e0364
The top edit by added text is actually vandalism:
Max. text added: 2007-03-28, 23:46 • 207.172.220.53 • 548,937
Top 10 by added text -- graph is affected as well.
I'm not sure there's a way to tell a "vandalism" edit with a "good edit," at least with the data XTools can see...
The one option might be to look at the next edit and previous edit and see if they match. But then that wouldn't catch any partial rollbacks.
See T179996 for revert detection, which is already in the pipeline.
The end result of this task would be to add a notation if the top edit by added text is reverted, adding a notation to the "Max. text added" line. I'll take this task and give it a stab.