The ISC currently accepts either floating point expressions or correct Maple syntax as input. However, for Maple syntax requiring too long for evaluation, a timeout has been implemented.

Factors of ten (and decimal points) are ignored in the input: you should check the results and rescale as required. For example, see 1/640.

Related sites:

The Inverse Symbolic Calculator (ISC) uses a combination of lookup tables and integer relation algorithms in order to associate a closed form representation with a user-defined, truncated decimal expansion (written as a floating point expression). The lookup tables include a substantial data set compiled by S. Plouffe both before and during his period as an employee at CECM.

Report problems with this site here.

Inverse Symbolic Calculator

Here are a few numbers which the Standard Lookup cannot handle, but which the Advanced Lookup can find: