# a+certain+number+of

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**7 (number)**— Seven redirects here. For other uses, see Seven (disambiguation). 7 −1 0 1 2 3 4 5 6 7 8 9 → List of numbers Integers …82

**Natural number**— Natural numbers can be used for counting (one apple, two apples, three apples, ...) from top to bottom. In mathematics, the natural numbers are the ordinary whole numbers used for counting ( there are 6 coins on the table ) and ordering ( this is …83

**Social Security number**— In the United States, a Social Security number (SSN) is a 9 digit number issued to citizens, permanent residents, and temporary (working) residents under section 205(c)(2) of the Social Security Act, codified as uscsub|42|405|c|2. The number is… …84

**999 (emergency telephone number)**— A sign on a beach in Whitstable, United Kingdom, advising readers to dial 999 in the event of an emergency 999 is an official emergency telephone number in a number of countries which allows the caller to contact emergency services for urgent… …85

**9 (number)**— This article is about the number. For other uses, see 9 (disambiguation). 9 −1 0 1 2 3 4 5 6 7 8 9 → List of numbers Integers …86

**4 (number)**— Four redirects here. For other uses, see 4 (disambiguation). 4 −1 0 1 2 3 4 5 6 7 8 9 → List of numbers Integers …87

**Analytic number theory**— In mathematics, analytic number theory is a branch of number theory that uses methods from mathematical analysis to solve number theoretical problems. [Page 7 of Apostol 1976] It is often said to have begun with Dirichlet s introduction of… …88

**Multiply perfect number**— In mathematics, a multiply perfect number (also called multiperfect number or pluperfect number) is a generalization of a perfect number. For a given natural number k, a number n is called k perfect (or k fold perfect) if and only if the sum of… …89

**Magic number (sports)**— For other uses of the term, see Magic number (disambiguation). In certain sports, a magic number is a number used to indicate how close a front running team is to clinching a season title. It represents the total of additional wins by the front… …90

**3000 (number)**— 3000 (three thousand) is the natural number following 2999 and preceding 3001. It is the smallest number requiring thirteen letters in English (when and is required from 101 forward). In other fields In the novel The Brothers Karamazov by Fyodor… …