Do you have paraskevidekatriaphobia or triskaidekaphobia?
I had first heard that 13 was unlucky because that was the number of turns in a hangman's noose. And I once read a wacky conspiracy that 13 was vilified misogynistically by early patriarchal religions, as they saught to displace matriarchal religions, because 13 was the number of lunar cycles (and other cycles) in a calendar year. I think the author of that conspiracy was an ancient PCBM long.
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