You can set the numbers in admincp. Yours is the same as mine.
Right, but in the ACP it says "Enter a list of days (separated by commas) that you would like to allow your users to search for new images from." But no matter what you put in there, the search is exactly the same. It looks like you're supposed to be able to give users the option of searching for the newest 1,2,5,... however many images.