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You gotta tell the alien that you use base-22
Base 20. 1,2,3,4,10,11,12,13,14,20
pretty sure base 4 goes “1, 2, 3, 10”
That’s base 5.
No it’s base 10
just as theres no single numeral for 10 in base 10, theres no numeral for 4 in base 4.
1 2 3 10 11 12 13 20 21 22
You forgot to count 0. The alien should write 4 as 10, not 4.