An Introduction to Number Theory
YouTube - Techquickie Binary Numbers and Base Systems
15 Jun 2014 3m45s
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The table of number bases shown @ 1m57s is here: Number Bases
YouTube - Artifexian Why these are the best numbers
30 Dec 2019 3m26s
Follow-up video 8 Jan 2020 7m12s
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https://en.wikipedia.org/wiki/Kaktovik_Inupiaq_numerals
“The Kaktovik numerals are a base-20 system created by Alaskan Iñupiat. They are visually iconic, with shapes that indicate the number being represented”
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