Maybe I'm missing something, but if you want a "small" (whatever that means) random prime number then generating a random number, testing whether it's a prime and then generating tens and hundreds more until you accidentaly tramp over a prime sounds horribly inefficient to me. And actually not gauranteed to finish at all. Unless your "small" means something like "less than 20" primes are fairly sparse so on average you have to generate quite a few random numbers to find a single prime. For a reasonable definition of "small" you'd be much better off if you just pregenerate a list of all "small" primes and then keep selecting a random item from the list.

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