Base62

In base62 encoding, there are 62 possible characters. So we have

• 0-9: 10 characters
• a-z: 26 characters
• A-Z: 26 characters.

For example to convert $11157_{10}$ (base 10) to base 62, we do the following:

$11157_{10} = 2 \times 62^2 + 55\times 63^1 + 2\times62^0$

The number 2, 55 and 59 comes from the remainders:

Therefore, $11157_{10} = 2TX_{62}$