Tool, algorithm or method to know which resistors to use for an equivalent resistance $R_T$?

Say I have to get a resistance $R_{T}$ and I have a bunch of resistors, $R_1, R_2, \ldots, R_n$.

Does there exist a tool, algorithm, or method that gets the resistance value closest to $R_T$ by connecting (one or more) of the resistors $R_1, R_2, \ldots, R_n$ in series, in parallel or a combination of those two? And how to connect those resistors to get that value? So not trial and error. :)

Thanks in advance.