I deleted a question that I asked on the mathematics meta stackexchange but someone undeleted it lol. I deleted it again, lol.
I created a checksum which is a generalization of the ISBN-10 checksum (one could perhaps call it the ISBN-n checksum).
^ Asked for someone to check my proof, question got closed for "not enough detail" lol.
Now you can see the proof in my blog post.
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