The base 8 notational system for representing real numbers. The digits used are 0, 1, 2, 3, 4, 5, 6, and 7, so that (8 in base 10) is represented as () in base 8. The following table gives the octal equivalents of the first few decimal numbers.
1 | 1 | 11 | 13 | 21 | 25 |
2 | 2 | 12 | 14 | 22 | 26 |
3 | 3 | 13 | 15 | 23 | 27 |
4 | 4 | 14 | 16 | 24 | 30 |
5 | 5 | 15 | 17 | 25 | 31 |
6 | 6 | 16 | 20 | 26 | 32 |
7 | 7 | 17 | 21 | 27 | 33 |
8 | 10 | 18 | 22 | 28 | 34 |
9 | 11 | 19 | 23 | 29 | 35 |
10 | 12 | 20 | 24 | 30 | 36 |
The song "New Math" by Tom Lehrer (That Was the Year That Was, 1965) explains how to compute in octal. (The answer is .)