Altough we can batch renaming the file with # option, but we can't decide where to start with...easily.
For example, start with 2 and step 3,
00.jpg→2.jpg
01.jpg→5.jpg
02.jpg→8.jpg
At least, I hope we can chose to start with "0" or "1", then I don't have to create a dummy file for the "0" in that sequence.