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What is special about 18?

It is known to be a solitary number, despite not being coprime to this sum. It is the number of one-sided pentominoes. It is the only number where the sum of its written digits in base 10 (1+8 = 9) is equal to half of itself (18/2 = 9). It is a Fine number.

en.wikipedia.org - 18 (number) - Wikipedia

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Promotion

"XVIII" redirects here. For the Eighteen Visions album, see XVIII (album)

Natural number

18 (eighteen) is the natural number following 17 and preceding 19.

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As lucky or unlucky number [ edit ]

In Chinese tradition, 18 is pronounced 十八 ; shí bā and is considered a lucky number due to similarity with 實發 ; shì fā 'definitely get rich', 'to get rich for sure'. [5] ; and is considered a lucky number due to similarity with ; 'definitely get rich', 'to get rich for sure'. According to applications of numerology in Judaism, the letters of the word chai ("living") add up to 18. Thus, 18 is considered a lucky number and many gifts for B'nai Mitzvot and weddings are in $18 increments.[6]

Age 18 [ edit ]

In most countries, 18 is the age of majority, in which a minor becomes a legal adult. It is also the voting age, marriageable age, drinking age and smoking age in most countries, though sometimes these ages are different than the age of majority. Many websites restrict adult content to visitors who claim to be aged over 18. In the United States, 18 is the: Age for sexual consent in eleven states and under federal law. [7] Minimum age to purchase firearms in thirty-eight states with the exception of handguns (21 under federal law). [8] Marriageable age without parental consent except for Nebraska (19), Mississippi and Puerto Rico (21). The minimum age at which one can purchase, rent, or buy tickets to NC-17-rated films or buy video games with an Adults Only rating. In the UK, it is the legal age to purchase a BBFC "18" rated film.