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maths nerdsnipe: numerical base where 9+10=21 (written exactly like this)

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@ben the racclosest i have gotten is bijective bases where in bijective nonary 9+11=21

ofc it’s 9+10 and 0 is not a digit in that base

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@charlotte @ben Now we just need a formal proof /j

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@charlotte base 9.5? who says the numerical base has to be an integer...
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@miifox that would be 19 tho (18.5 in decimal) not 21 (20 in decimal)

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