13 (number) - Wikipedia
https://en.wikipedia.org/wiki/13_(number)
OverviewIn mathematicsIn scienceIn languagesIn religionLuckAge 13History13 (thirteen) is the natural number following 12 and preceding 14. Strikingly folkloric aspects of the number 13 have been noted in various cultures around the world: one theory is that this is due to the cultures employing lunar-solar calendars (there are approximately 12.41 lunations per solar year, and hence 12 "true months" plus a smaller, and often portentous, thirteenth month). This can be witnessed, for example, in the "Twelve Days of … Cardinal: thirteen Ordinal: 13th, (thirteenth)
Cardinal: thirteen
Ordinal: 13th, (thirteenth)
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