seventeenth day of the month

The Japanese festival for children; a traditional rite of passage and festival day in Japan for three- and seven-year-old girls and three- and five-year-old boys, held annually on November 15. As Shichigosan is not a national holiday, it is generally observed on the nearest weekend. Similar to こどもの日 (Kodomo no Hi, literally “Children's Day”)

十三参り: A celebration for girls who have reached the age of thirteen.

十三日: thirteenth day of the month

(number theory) twin prime, a prime number that is either 2 less or 2 more than another prime number, such as 3 and 5

seven

a seven / a gambler

a surname

seven, 7

(colloquial) seven, 7