Base 42 to Base 39

Base 42

In base 42, each digit position represents a power of 42: the rightmost digit counts individual ones, the next counts groups of 42, the next counts groups of 42×42, and so on — the same place-value idea as base 10, just with 42 distinct digits instead of ten.

Base 39

Base 39 works the same way: the rightmost digit counts ones, the next counts groups of 39, the next counts groups of 39×39, and so on, using 39 distinct digits.