Base36 is a binary-to-text encoding scheme that represents binary data in an ASCII string format by translating it into a radix-36 (aka Hexatrigesimal) representation. The choice of 36 is convenient in that the digits can be represented using the Arabic numerals 0–9 and the Latin letters A–Z (the ISO basic Latin alphabet).
| hexatrigesimal (base 36) | senary (base 6) | hexatrigesimal (base 36) | senary (base 6) |
|---|---|---|---|
| 1 | = 1 | b | = 15 |
| 2 | = 2 | c | = 20 |
| 3 | = 3 | d | = 21 |
| 4 | = 4 | e | = 22 |
| 5 | = 5 | f | = 23 |
| 6 | = 10 | g | = 24 |
| 7 | = 11 | h | = 25 |
| 8 | = 12 | i | = 30 |
| 9 | = 13 | j | = 31 |
| a | = 14 | k | = 32 |
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.
| senary (base 6) | hexatrigesimal (base 36) | senary (base 6) | hexatrigesimal (base 36) |
|---|---|---|---|
| 1 | ≈ 1 | 15 | ≈ b |
| 2 | ≈ 2 | 20 | ≈ c |
| 3 | ≈ 3 | 21 | ≈ d |
| 4 | ≈ 4 | 22 | ≈ e |
| 5 | ≈ 5 | 23 | ≈ f |
| 10 | ≈ 6 | 24 | ≈ g |
| 11 | ≈ 7 | 25 | ≈ h |
| 12 | ≈ 8 | 30 | ≈ i |
| 13 | ≈ 9 | 31 | ≈ j |
| 14 | ≈ a | 32 | ≈ k |
| hexatrigesimal (base 36) | senary (base 6) |
|---|---|
| 1 | = 1 |
| 2 | = 2 |
| 3 | = 3 |
| 4 | = 4 |
| 5 | = 5 |
| 6 | = 10 |
| 7 | = 11 |
| 8 | = 12 |
| 9 | = 13 |
| a | = 14 |