From theatrical_muse: Thirteen
Some people think thirteen's an unlucky number, not sure why. Because it's one more than a nice round dozen? Not that I know why a dozen should be round, but for some reason buns and muffins seem to come in dozens. Or sixes. Easier to pack, I suppose. Or maybe it's because it's a prime number? But then, so's seven, and lot's of people seem to think that one's lucky.
Anyway I've never been superstitious. I don't see how putting on a pair of lucky socks or carrying a die (yes, Avon, I do know the singular for dice) around in your pocket should change anything. Maybe having a gun or wearing an armoured vest would, but I'd hardly say that was lucky. Just being careful.
That said, I do think I've had more than my share of bad luck, but that's just the way things go in a random universe full of bastards and the Federation (with a fair lot of overlap there).