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Octal numeral system
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The octal numeral system is a place-value numeral system based on the powers of 8, sometimes used as a shorthand for the binary numeral system.
For example, 11001001 is 311:
128s 64s 32s 16s 8s 4s 2s 1s 1 1 0 0 1 0 0 1 3 1 1
Compare hexadecimal.