Hi again

I'm trying to learn about octal numbers and I don't understand this:

Binary: 001000101111
breakdown: (001)= 1 (000)= 0 (101)=5 (111)=7

I know it's similar to unix permissions, but I'm not understanding where for 
example: 111 = 7

wikipedia has got me all confused.

-- 
Blessings,
David M.

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