RIES tool for approximating numbers

ries (or RIES, an acronym for RILYBOT Inverse Equation Solver) takes any number and produces a list of equations that approximately solve to that number.

It is any interesting tool and can be used in a pinch to solve for an equation that cannot be determined easily. For examples if one has a number of data points finding an equation that each data point has in common is a way to determine a fitting equation that is not necessarily limited to polynomial fitting.

A humorous example of this is the xkcd comic.