A LONGGGGGGGG! time ago I wrote a DOS program using Turbo Pascal, actually on a laptop running a 386SX16 with 4MB of RAM.
The program was for calculating parallel resistors, you simply enter the value you wanted and it gave you the two nearest preferred E12 values, along with the percentage of error.
This could easily be modified to calculate potential dividers, if I can find the original code I'll give it a go!.
But, like everyone else, I'd like to know what it's for?, and why you specified it to such precision?.