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| {{examplefarm|date=March 2010}}
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| {{Infobox number
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| | number = 79
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| | factorization = [[prime number|79]]
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| | prime = 22nd
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| | divisor = 1, 79
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| }}
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| '''Seventy-nine''' is the [[natural number]] following [[78 (number)|78]] and preceding [[80 (number)|80]].
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| ==In mathematics==
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| *An [[even and odd numbers|odd]] number
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| *The smallest number that can't be represented as a sum of fewer than 19 [[fourth power]]s
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| *A strictly non-[[palindromic number]]
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| *The 22nd [[prime number]] (the next is [[83 (number)|83]])
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| *The smallest prime number ''p'' for which the [[real quadratic field]] '''Q'''[√''p''] has [[class number]] greater than 1 (namely 3)<ref>H. Cohen, ''A Course in Computational Algebraic Number Theory'', GTM 138, Springer Verlag (1993), Appendix B2, p.507. The table lists fields by [[Real quadratic field#Discriminant|discriminant]], which is 4''p'' for '''Q'''[√''p''] when ''p'' is [[modular arithmetic|congruent]] to 3 modulo 4, as is the case for 79, so the entry appears at discriminant 316.</ref>
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| *A [[cousin prime]] with [[83 (number)|83]]
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| *An [[emirp]], because the reverse of 79, [[97 (number)|97]], is also a prime
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| *A [[fortunate prime]]
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| *A prime number that is also a [[Gaussian prime]] (since it is of the form <math>4n + 3</math>)
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| *A [[happy prime]]
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| *A [[Higgs prime]]
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| *A [[Kynea number|Kynea prime]] (<math>(2n + 1)^2-2</math>)
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| *A [[lucky prime]]
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| *A [[permutable prime]], with [[97 (number)|ninety-seven]]
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| *A [[Pillai prime]], because 23[[Factorial|!]] + 1 is [[divisible]] by 79, but 79 is not one more than a [[Multiple (mathematics)|multiple]] of [[23 (number)|23]]
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| *A [[regular prime]]
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| *A prime in a [[Dirichlet's theorem on arithmetic progressions|residue classes]] 4n+3, 8n+7, and 10n+9
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| *A [[right-truncatable prime]], because when the last digit (9) is removed, the remaining number (7) is still prime
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| *A [[sexy prime]] (with [[73 (number)|73]])
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| *The ''n'' value of the [[Wagstaff prime]] 201487636602438195784363
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| ==In science==
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| The [[atomic number]] of the [[chemical element]] [[gold]] (Au) is 79.
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| ===In astronomy===
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| *[[Messier 79|Messier object 79]] (M79), a [[visual magnitude|magnitude 8.5]] [[globular cluster]] in the [[constellation]] [[Lepus (constellation)|Lepus]]
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| *[[List of NGC objects (1-999)|New General Catalogue object 79]] (NGC 79), a [[galaxy]] in the constellation [[Andromeda (constellation)|Andromeda]]
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| *[[Saros cycle|Saros series]] 79, which began on -434 May 21 and ended on 828 June 16, lasting 1262.1 years, and with 71 [[lunar eclipse]]s
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| *[[Saros cycle|Saros series]] 79, which began on -150 February 16 and ended on 1166 April 12, lasting 1316.2 years, and with 74 [[lunar eclipse]]s
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| ==In other fields== | |
| * [[Live Seventy Nine]], an album by [[Hawkwind]]
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| * The years [[79|79 AD]] (or CE), [[79 BC]](E), or [[1979]]
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| * Any of several [[List of highways numbered 79|highways numbered 79]]
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| * The record cumulative weeks at #1 on the [[Billboard (magazine)|Billboard]] charts, held by [[Elvis Presley]]
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| * The number of the [[Departments of France|French department]] [[Deux-Sèvres]]
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| ==References==
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| {{Reflist}}
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| {{Integers|zero}}
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| {{DEFAULTSORT:79 (Number)}}
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| [[Category:Integers]]
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