iteration and stack overfloow

[Elim Qiu <elim.qiu@gmail.com>]

I think this was posted a while before, but I don't really have a workable solution yet:

an(n) = 

{ my(v = 0.5);

  for(k=1,n,v=log(1+v));

  return(n*v)

}

call an(10000) will cause stack overfloow, but I'd like to computer an(700000).

What should I do? Thanks