The greatest value a digit can have in base for is 3. Thus the largest three-digit number in base for would be 333. In base 10, this number is 3x16 + 3x4 + 3 = 63
Therefore 63 is the largest digit that would be three digits in base 4.
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In base ten, there are 9000 four digit number, the numbers are from 1000 to 9999. If you allow leading zeros, then there are 10000 numbers. [0000 - 9999]
This is the UN Identification Number.
Four
A pyramid with a four sided base has five faces and five corners.
It is 0.000009 approx.