Currently 13 is considered to be an unlucky number. However, I am told it used to be–and in some earth-worshiping, i.e., pagan, religions still is–a lucky and magical number. Consequently there were 13 months and 13 zodiac signs (the Gemini twins had separate identities). Knowing how Christianity and other god-as-a-man-based religions were prone to say what the pagans (Earth-and-god-as-a-woman) considered good was bad, I wonder if this was the case with the number 13. And why was 13 singled out of an infinity of numbers in the first place? Also, if the number 13 is so bad, why is it reflected so many times on the U.S. $1 bill–13 levels in the pyramid, 13 stars, 13 arrows, 13 stripes, 13 leaves, and 13 olives? Is it because of the original 13 colonies? –L.S. Thomas, Berkeley, California

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With regard to your last question, L., of course not. It’s just one of those wacky coincidences. The matter of how 13 came to be a numerological pariah, on the other hand, is an interesting story. While your rap about the pagans is a little off the wall (Thor the feminist?), you’re right about one thing: 13 hasn’t always been considered unlucky.

Pretty thin excuse for maligning a number that never meant any harm, you may think. I agree. We must inquire further, and if we do we conclude that while open hostility to 13 may be relatively recent, folks have had their suspicions about it for quite a while. Thirteen is a prime; primes have always attracted attention (compare 7). What’s worse, 13 is one past 12, a dozen, almost universally regarded as a perfect number, signifying harmony and all good things. Thirteen, by contrast, is a number of transgression, taking matters one step too far, turning harmony into discord.