The folowing table expresses '18' in various number bases. 'DRx' shows the result of 'digit reducing' resulting in an X-digit long number.
| Base | DR5 | DR4 | DR3 | DR2 | DR1 |
|---|---|---|---|---|---|
| 2 | 10010 | 10 | 1 | ||
| 3 | 200 | 2 | |||
| 4 | 102 | 3 | |||
| 5 | 33,11 | 2 | |||
| 6 | 30 | 3 | |||
| 7 | 24 | 6 | |||
| 8 | 22 | 4 | |||
| 9 | 20 | 2 | |||
| 10 | 18 | 9 | |||
| 11 | 17 | 8 | |||
| 12 | 16 | 7 | |||
| 13 | 15 | 6 | |||
| 14 | 14 | 5 | |||
| 15 | 13 | 4 | |||
| 16 | 12 | 3 |
Factors: 2 * 32
A 'Octadecagon' is a 'regular polygon' with 18 sides.
18 is the atomic weight of Argon (Ar).