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I came accross this clock: enter image description here

It features only the numbers 1, 2 and 3 in that order to get all of the numbers. However I have absolutely no idea what the notation is for number 5. If anyone cannot see the image it is basically $12_3$.

Just to clarify the answer to $12_3$ should be 5.

5xum
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TheLethalConstant
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1 Answers1

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It is one of the common notations for numeral systems in different bases. In this case it is the ternary system. See, $12_3=1\cdot3^1+2\cdot3^0=5$.

Ivan Neretin
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