Found this little story over on BuzzFeed thanks to our friends at
We definitely want to try numbers: 6, 8, 10, 13, 16, 18, 24, 30, 33, 35
We've seen (and can vouch for) numbers: 1, 7, 19, 21
Quite a few are survival-related or are great for emergencies, so definitely go through the list & take notes on things you'll add to your routing/kits.
From: BuzzFeed.com