There are several types of "psuedo-random number generators" out there. 
Most of them work by having some sort of "seed", and a function that 
takes the seed and generates a new random number and a new seed.

This is great if you just want to produce a really long stream of random 
numbers. But are there any PRNGs out there which offer random (!) access 
to the stream of numbers? In other words, the ability to compute the Nth 
random number without needing to compute any of the preceding ones?

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