# Number+to+be+divided

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**Number One Crossbar Switching System**— The Number One Crossbar Switching System, or 1XB switch, was the primary urban local telephone exchange design used by the Bell System in the mid 20th century. Its switch fabric topology was based on the earlier urban panel switch system, which,… …22

**number**— 1. A symbol expressive of a certain value or of a specific quantity determined by count. 2. The place of any unit in a series. atomic n. (Z) the n. of protons in the nucleus of an atom; it indicates the position of the …23

**F-number**— In optics, the f number (sometimes called focal ratio, f ratio, or relative aperture [Smith, Warren Modern Lens Design 2005 McGraw Hill] ) of an optical system expresses the diameter of the entrance pupil in terms of the focal length of the lens; …24

**Harshad number**— A Harshad number, or Niven number in a given number base, is an integer that is divisible by the sum of its digits when written in that base. Harshad numbers were defined by D. R. Kaprekar, a mathematician from India. The word Harshad comes from… …25

**Coxeter number**— In mathematics, the Coxeter number h is the order of a Coxeter element of an irreducible root system, Weyl group, or Coxeter group. DefinitionsThere are many different ways to define the Coxeter number h of an irreducible root system.*The Coxeter …26

**134 (number)**— Number|number = 134 cardinal = one hundred [and] thirty four ordinal = th ordinal text = one hundred [and] thirty fourth numeral = factorization = 2 cdot 67 prime = divisor = 1, 2, 67, 134 unicode = greek prefix = latin prefix = misc =134 is the… …27

**odd number**— number which leaves a remainder of one when divided by two …28

**prime number**— number that can only be divided by itself and 1 without remainders …29

**Route number**— A road number is often assigned to a stretch of public roadway. The number chosen is often dependent on the type of road, with numbers differentiating between interstates, motorways, arterial thoroughfares, two lane roads, and so forth. Contents… …30

**Prime number**— Prime redirects here. For other uses, see Prime (disambiguation). A prime number (or a prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. A natural number greater than 1 that is not a prime number is… …