AppleScript to copy images that names are multiple of 30 to another folder
You can do this from the command line. The following will match all images which are a multiple of 30 and copy them to the destination folder.

/bin/zsh -c "cp /path/to/source/Montana_{30..4500..30}.jpg /path/to/destination/"



Replace /path/to/source with the path to the containing folder for the images.
Replace 4500 with the number of the last image in the folder.
Replace /path/to/destination with the path to the containing folder where the images which are a multiple of 30 will be copied to.


To move instead of copy, replace cp with mv.
To use this in an AppleScript, you can ‘do shell script’.