Re:Why pseudo-random for research? Reproducibility (Score 2, Insightful)

You don't save them for the same reason that you don't necessarily save the state of the simulation after every state change. You're generating a lot of these things, conceivably billions and billions or more. Even if you do save that kind of data for the short term--be it the pseudorandom sequence or state changes or both--you may want to eventually delete it while still having the option of re-creating it at a later date. With a reproducible pseudo-random generator, you can do this by saving only the parameter settings and the seed value.