After looking at some dismal online factorisation algorithms, I wondered whether I could do a better job, so I wrote a Javascript version, which is mainly a port of my Python factorisation algorithm, with a port and modification of a Python ECM implementation (acknowledgement in the website).
The algorithm implements Miller-Rabin primality testing, and factorisation using trial division by small primes, Pollard Rho algorithm and Elliptic Curve Method (ECM) using Montgomery curves.
The factorisation website is here.
