This takes a decimal number and converts it to a number system that you can specify by a list of arbitrary digits that can also be symbols. The output is in list format.
i made this a while ago and wanted to expand it so you could choose the output format to be a number (if possible), a symbol or a list and be able to specify the origin number system so it could convert in both directions. It is almost finished, but as i don't have the time right now, i just post this simple version. 