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Odd number

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An integer that is not divisible by $2$ (without remainder). Odd numbers are: $\pm1, \pm3, \pm5, \pm7, \pm9, \pm11,\dots$

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An integer that is not odd is called even (cf. Even number).

How to Cite This Entry:
Odd number. Encyclopedia of Mathematics. URL: http://www.encyclopediaofmath.org/index.php?title=Odd_number&oldid=29222