Why is it that hexadecimal has both F and 0 when F is the 16th character in the sequence? Why is the same true of decimal notation? Doesn't this mean it is not compatible with modular arithmetic where 16 mod 16 is 0? Why was it done this way?
2026-04-09 15:29:46.1775748586
Hexadecimal vs. Mod 16
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It's no different than the fact that $9$ is the tenth decimal digit.