why octal number system jumping from 7 to 10 instead 8?

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I know the question is really confusing but I have a questin about Octal number system. I am reading a book and on the counting in octal as shown

0,1,2,3,4,5,6,7,10,11,....,16,17,20 ?

why does the number is not followed by 8,18,19 and so on?

thanks!

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Not confusing at all! The jump from 7 to 10 is precisely the point! The octal system represents numbers in base 8, which means that each digit represents a power of 8. Therefore, the 1's place only needs the digits 0-7, and the number 10 in octal (NOT the decimal number 10), is $1\times8^1 + 0\times8^0 = 8$ in decimal.