See also Douglas Crockford's Base 32: https://www.crockford.com/base32.html
This takes the approach of allowing ambiguous characters by decoding them to the same value, and also considers the problem of accidental obscenities.
This takes the approach of allowing ambiguous characters by decoding them to the same value, and also considers the problem of accidental obscenities.
5-bit base-32 oi23456789 abcdefghkl mnpqrstuvw y
o = 0 i = 1 j, x and z removed.
I like that you can fit 6 characters in an 32-bit integer and still have to bits to spare... makes for compact usernames and network bandwidth.