TITLE: How to find possible closed-form-formula for a given decimal expansion online?
QUESTION [8 upvotes]: What mathematical program or library can guess formula for decimal fraction? For example, for number 2.414213562373095 right guess is 1 + $\sqrt 2$. Are there such tools online? I cannot find one.

REPLY [4 votes]: Using keywords from Peter's comment ("closed form by decimal expansion") I found Inverse Symbolic Calculator
Also see Sympy number identification