Dave,
Kindle sorts by the Title FIELD, so if that field starts with a number, it will sort by that number. You could do that manually in Calibre, but most people seem to use the plugboard facility - this adjusts the metadata as the book is downloaded, according to rules you set.
I haven't experimented with it myself so you would have to search the help for info about plugboards. (or just jump right in in the settings and see what works)
Good Luck,
Liz
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