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How many of the 343 smallest positive integers written in base 7 use 4 as a digit?

 Oct 16, 2020
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There are 127 integers in base 7 to use the digit 4 in the first 343 integers without counting the repeats such as 44 or 444.....etc. If you include the repeats, then there are 147 integers that use the digit 4.

 
 Oct 16, 2020

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