The idea of what "random" means turns out to not be very simple after all. I think in a typical definition (at least as used for CS?), a "random" sequence of numbers _by definition_ has no predictable pattern to it -- that's what makes it random. Of course, a given sequence of random numbers could _happen_ to have all sorts of patterns in it (and indeed, you could find patterns to post-fit to any sequence), but if you can predict it in advance... it's not "random"? I think?