I seriously doubt the foliator calculated how many numbers to skip at various points while numbering the pages in honour of the author, especially because the pages are certainly not in the original order. The missing pages were there at one time, when they were cut out or when they fell out is pure speculation at this point.
The foliator simply flipped through the top right of the codex sitting in front of him happily numbering away without any time spent unfolding the folios folded in on themselves or checking to make sure the pages were in the right place or the quires were aligned properly, etc...
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