++ for suggesting a pseudo random generator! :)

This thread became (as usual) so long b/c the OP doesn't give us much detail, like

• motivation: why the numbers need to be random
• quantity: how many of them need to be generated
• performance: how fast the solution needs to be

My first guess was to suggest a very simple algebraic Linear congruential generator where each element in the sequence is predictable and collisions are avoided.

But as usual because of lack of information we try to answer a wide range of possible questions. :(