Octal - Base Eight

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Octal Numbers use only the digits 0 or 7.

For a 5-digit octal number, the column weightings are:

4096 512 64 8 1

Each weighting is 8x the weighting to its right. The first one is always 1.

The smallest 5-digit octal number 00000
    represents 0x4096 + 0x512 + 0x64 + 0x8 + 0x1 =         0.
The  largest 5-digit octal number  77777
    represents 7x4096 + 7x512 + 7x64 + 7x8 + 7x1 = 32767.

The place value of the bold digit in the octal number 24307
    is 4x512 = 2048.