gmp-ecm
Elliptic Curve Method for Integer Factorization
GMP-ECM reads the numbers to be factored from stdin (one number on each line) and requires a numerical parameter, the stage 1 bound B1. A reasonable stage 2 bound B2 for the given B1 is chosen by default, but can be overridden by a second numerical parameter. By default, GMP-ECM uses the ECM factoring algorithm.
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