When you say "predictable", do you mean "repeatable?" Or do you really mean "predictable?" In the latter case, well, if you want predictable numbers you should

When you say "predictable", do you mean "repeatable?" Or do you really mean "predictable?" In the latter case, well, if you want predictable numbers you shouldn't be calling a RNG at all. And in the former, it's not good, it's broken, PRNGs are supposed to produce the same sequence, given the same seed....