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I could make that from two text lists indeed, that would be easier 
Actually on the server images are stored in a folder from the first 3 digits of the number, to avoid having more than 1000 pics in the same folder (or else it takes an awful long time to access remotely).
Making a list of files across all subfolders is still easy, though that a list of 600000+ files takes several seconds to make - so I can't really make a dynamic page listing that in public.
So that would be a simple static list of the IDs. But I guess that for Gamer's game of completing missing vehicle pics it would already be enough.
I'll do that when I've some time in the next days.
Actually on the server images are stored in a folder from the first 3 digits of the number, to avoid having more than 1000 pics in the same folder (or else it takes an awful long time to access remotely).
Making a list of files across all subfolders is still easy, though that a list of 600000+ files takes several seconds to make - so I can't really make a dynamic page listing that in public.
So that would be a simple static list of the IDs. But I guess that for Gamer's game of completing missing vehicle pics it would already be enough.
I'll do that when I've some time in the next days.