The senary numeral system (also known as base-6 or heximal) has six as its base. It has been adopted independently by a small number of cultures. Like decimal, it is a semiprime, though being the product of the only two consecutive numbers that are both prime (2 and 3) it has a high degree of mathematical properties for its size. As six is a superior highly composite number, many of the arguments made in favor of the duodecimal system also apply to this base-6.
conversion table
| senary (base 6) | base 5 | senary (base 6) | base 5 |
|---|
| 1 | = 1 | 15 | = 21 |
| 2 | = 2 | 20 | = 22 |
| 3 | = 3 | 21 | = 23 |
| 4 | = 4 | 22 | = 24 |
| 5 | = 10 | 23 | = 30 |
| 10 | = 11 | 24 | = 31 |
| 11 | = 12 | 25 | = 32 |
| 12 | = 13 | 30 | = 33 |
| 13 | = 14 | 31 | = 34 |
| 14 | = 20 | 32 | = 40 |