4 of 6 added 64 characters in body

## JavaScript, 10310199 97

This implementation is based on primo's comprehensive description of the algorithm he used.

for(e=l=x=prompt(g=1e5);--g;y=x>1?1-1/x:x-1,l=y/g+(y<0?-y:y)*l)
e=1+e/g*x;