a+certain+number+of
71Illegal number — An illegal number is a number that under some interpretations and under some legislation represents information which is illegal to possess, utter or propagate. Any information that can be represented in binary format is, ipso facto ,… …
7226 (number) — This article is about the number. For the novel by Leo McKay, Jr., see Twenty six (novel). ← 25 27 → 26 ← 20 …
73NATO Stock Number — A NATO Stock Number, or National Stock Number (NSN) as it is known in the US, is a 13 digit numeric code, identifying all the standardized material items of supply as they have been recognized by all NATO countries including United States… …
74Lucky number — In number theory, a lucky number is a natural number in a set which is generated by a sieve similar to the Sieve of Eratosthenes that generates the primes.Begin with a list of integers starting with 1: 1, 2, 3, 4, 5, 6, 7, 8,… …
75Constructible number — For numbers constructible in the sense of set theory, see Constructible universe. A point in the Euclidean plane is a constructible point if, given a fixed coordinate system (or a fixed line segment of unit length), the point can be constructed… …
76Preferred number — In industrial design, preferred numbers (also called preferred values) are standard guidelines for choosing exact product dimensions within a given set of constraints. Product developers must choose numerous lengths, distances, diameters, volumes …
77Train reporting number — A headcode or train reporting number is used by railway staff in Great Britain to identify a particular train service. It consists of:* A single digit number, indicating the class (type) of train * A letter, indicating the destination area * A… …
78complex number — a mathematical expression (a + bi) in which a and b are real numbers and i2 = 1. [1825 35] * * * Any number consisting of both real numbers and imaginary numbers. It has the form a + bi, where a and b are real numbers and i = 1; a is called the… …
79Perfect number — In number theory, a perfect number is a positive integer that is equal to the sum of its proper positive divisors, that is, the sum of its positive divisors excluding the number itself (also known as its aliquot sum). Equivalently, a perfect… …
80Surreal number — In mathematics, the surreal number system is an arithmetic continuum containing the real numbers as well as infinite and infinitesimal numbers, respectively larger or smaller in absolute value than any positive real number. The surreals share… …
