title: Generate next pseudo random value given a seed and offset
body: <p>Is it possible, for a given implementation of <code>rand</code>, to efficiently generate the next number in the sequence given an initial seed and the number of calls to <code>rand</code> so far?</p>
  
  <p>What I'd like is to use <code>rand</code> to provide a time offset for nodes in a simulation. Each node would seed with it's unique id and use the outputs of <code>rand</code> to provide jitter in delays in the simulation. I'd like each node to be able to calculate the next delay for any other node to measure collisions. I have access to the initial seed for any node and the number of times <code>rand</code> has been called. </p>
  
  <p>I'd like to avoid having to seed and loop <code>n + 1</code> times to get the next value. Is what I want even possible with a generic linux implementation of <code>rand</code>?</p>