ries

find algebraic equations, given their solution
  https://mrob.com/pub/ries/
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Given a number, ries searches for algebraic equations in one variable that have a solution (root) near that number. It avoids trivial or reducible solutions like ``x/x = 1''. If the input is an integer, ries can find an exact solution expressed in terms of single-digit integers.

The output gives progressively ``more complex'' equations that come progressively closer to matching the input number.