13 (number)
Natural number / From Wikipedia, the free encyclopedia
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13 (thirteen) is the natural number following 12 and preceding 14.
Quick Facts ← 12 13 14 →, Cardinal ...
| ||||
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Cardinal | thirteen | |||
Ordinal | 13th (thirteenth) | |||
Numeral system | tredecimal | |||
Factorization | prime | |||
Prime | 6th | |||
Divisors | 1, 13 | |||
Greek numeral | ΙΓ´ | |||
Roman numeral | XIII | |||
Binary | 11012 | |||
Ternary | 1113 | |||
Senary | 216 | |||
Octal | 158 | |||
Duodecimal | 1112 | |||
Hexadecimal | D16 | |||
Hebrew numeral | י"ג | |||
Babylonian numeral | 𒌋𒐗 |
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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 Christmas" of Western European tradition.[1]