Hi Cody,

People have come up with a bunch of interesting suggestions which probably solve your problem. However, in the spirit of TMTOWTDI, here's a lazy-programmer's solution:

• Store the most recent ones you've done in a hash, and save using Storable.
• Clear the hash every n runs, store the count of runs-since-last-clear in a scalar, and save it using Storable.
• In each run: do {pick a number} until (! exists $hash{this number})

Of course, you can only have one of these running at one time, or you'll shoot yourself in the foot.

hth!

andye