> And correct me if I'm wrong, but there are some algorithms in which
> using a prime number would be a bad idea. Anyway, it seems to me that
> any decent random stream generator should be able to take an arbitrary
> seed and produce a good result.
Primes etc. are really a figment of early linear congruential
generators, for which non-prime parameters in the generator itself were
famously bad choices (actually, not just non-prime but
non-relatively-prime). Knuth III is very interesting in that regard.