A nice alternative to 'lucky' and 'unlucky' numbers could be favorite and disliked numbers. My favorite number is 4, and my dislike number is 3. I don't know why, but the symbol 4 just looks good, while 3 looks bad.
Or, ok, it doesn't look very bad, but, the other numbers look better.
I was called "Mikkel 333" in the kindergarden. I hated it. 4, 2, 7, 8, 0, 9, 6, 1, 3.