So I Noticed that 21 Million is 2100 Times 10,000

Last week one of my students asked me why the limit for bitcoins issued is 21 million. And since he asked me in Japanese (I am teaching in Tokyo), his question was phrased like “2100 times ten thousand” (nisenhyaku man).

If you look at that number in this way, it suddenly starts to make sense. The number will peak in the 22nd Century, shortly after the year 2100.

And you won’t notice that point if you don’t think about numbers like a Japanese. I didn’t notice before hearing that question.

Which may be a hint that Satoshi Nakamoto is either Japanese, or from some other Eastern nation that counts large numbers by the 10,000s.

Lively discussion of this at the Bitcoin subreddit here.

Published by kflenz

Professor at Aoyama Gakuin University, Tokyo. Author of Lenz Blog (since 2003,

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