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by tow21 2396 days ago
My favourite illogical system is archaic Finnish, where it goes (roughly translated)

One, two, three, ... Second-one (11), second-two (12), second-three (13), ... Third-one (21), third-two (22), third-three (23), ...

ie you have an off-by-one error in the tens digit as you are counting.

Modern Finnish retains this for 11-19, but mercifully sanity returns for numbers above that.