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There have been various mystical numerological reflections about the fact that, according to the system of gematria, the Hebrew letters of chai (חַי) add up to 18 [2] (see Lamedvavniks etc.). For this reason, 18 is a spiritually meaningful number in Judaism. Many Jews give gifts of money in multiples of 18 (see below). [2]
18 is a semiperfect number [1] and an abundant number. It is a largely composite number, [2] as it has 6 divisors and no smaller number has more than 6 divisors. There are 18 one-sided pentominoes. In the classification of finite simple groups, there are 18 infinite families of groups. [3]
"A base is a natural number B whose powers (B multiplied by itself some number of times) are specially designated within a numerical system." [1]: 38 The term is not equivalent to radix, as it applies to all numerical notation systems (not just positional ones with a radix) and most systems of spoken numbers. [1]
Numeral or number prefixes are prefixes derived from numerals or occasionally other numbers. In English and many other languages, they are used to coin numerous series of words. In English and many other languages, they are used to coin numerous series of words.
The name of a number 10 3n+3, where n is greater than or equal to 1000, is formed by concatenating the names of the numbers of the form 10 3m+3, where m represents each group of comma-separated digits of n, with each but the last "-illion" trimmed to "-illi-", or, in the case of m = 0, either "-nilli-" or "-nillion". [17]
A prime number (or prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. ... 18 p − 1 ≡ 1 (mod p 2): 5, 7, ...
Argon is a chemical element; it has symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble gas. [10] Argon is the third most abundant gas in Earth's atmosphere, at 0.934% (9340 ppmv).
Perfect numbers are natural numbers that equal the sum of their positive proper divisors, which are divisors excluding the number itself. So, 6 is a perfect number because the proper divisors of 6 are 1, 2, and 3, and 1 + 2 + 3 = 6. [2] [4]