83 (number): Difference between revisions
Jump to navigation
Jump to search
→References: cs iw |
en>Wtmitchell m Reverted edits by 108.32.22.59 (talk) to last revision by David Eppstein (HG) |
||
| Line 1: | Line 1: | ||
{{examplefarm|date=March 2010}} | |||
{{Infobox number | |||
| number = 79 | |||
| factorization = [[prime number|79]] | |||
| prime = 22nd | |||
| divisor = 1, 79 | |||
}} | |||
'''Seventy-nine''' is the [[natural number]] following [[78 (number)|78]] and preceding [[80 (number)|80]]. | |||
==In mathematics== | |||
*An [[even and odd numbers|odd]] number | |||
*The smallest number that can't be represented as a sum of fewer than 19 [[fourth power]]s | |||
*A strictly non-[[palindromic number]] | |||
*The 22nd [[prime number]] (the next is [[83 (number)|83]]) | |||
*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> | |||
*A [[cousin prime]] with [[83 (number)|83]] | |||
*An [[emirp]], because the reverse of 79, [[97 (number)|97]], is also a prime | |||
*A [[fortunate prime]] | |||
*A prime number that is also a [[Gaussian prime]] (since it is of the form <math>4n + 3</math>) | |||
*A [[happy prime]] | |||
*A [[Higgs prime]] | |||
*A [[Kynea number|Kynea prime]] (<math>(2n + 1)^2-2</math>) | |||
*A [[lucky prime]] | |||
*A [[permutable prime]], with [[97 (number)|ninety-seven]] | |||
*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]] | |||
*A [[regular prime]] | |||
*A prime in a [[Dirichlet's theorem on arithmetic progressions|residue classes]] 4n+3, 8n+7, and 10n+9 | |||
*A [[right-truncatable prime]], because when the last digit (9) is removed, the remaining number (7) is still prime | |||
*A [[sexy prime]] (with [[73 (number)|73]]) | |||
*The ''n'' value of the [[Wagstaff prime]] 201487636602438195784363 | |||
==In science== | |||
The [[atomic number]] of the [[chemical element]] [[gold]] (Au) is 79. | |||
===In astronomy=== | |||
*[[Messier 79|Messier object 79]] (M79), a [[visual magnitude|magnitude 8.5]] [[globular cluster]] in the [[constellation]] [[Lepus (constellation)|Lepus]] | |||
*[[List of NGC objects (1-999)|New General Catalogue object 79]] (NGC 79), a [[galaxy]] in the constellation [[Andromeda (constellation)|Andromeda]] | |||
*[[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 | |||
*[[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 | |||
==In other fields== | |||
* [[Live Seventy Nine]], an album by [[Hawkwind]] | |||
* The years [[79|79 AD]] (or CE), [[79 BC]](E), or [[1979]] | |||
* Any of several [[List of highways numbered 79|highways numbered 79]] | |||
* The record cumulative weeks at #1 on the [[Billboard (magazine)|Billboard]] charts, held by [[Elvis Presley]] | |||
* The number of the [[Departments of France|French department]] [[Deux-Sèvres]] | |||
==References== | |||
{{Reflist}} | |||
{{Integers|zero}} | |||
{{DEFAULTSORT:79 (Number)}} | |||
[[Category:Integers]] | |||
Revision as of 03:01, 6 December 2013
Template:Examplefarm Template:Infobox number Seventy-nine is the natural number following 78 and preceding 80.
In mathematics
- An odd number
- The smallest number that can't be represented as a sum of fewer than 19 fourth powers
- A strictly non-palindromic number
- The 22nd prime number (the next is 83)
- The smallest prime number p for which the real quadratic field Q[√p] has class number greater than 1 (namely 3)[1]
- A cousin prime with 83
- An emirp, because the reverse of 79, 97, is also a prime
- A fortunate prime
- A prime number that is also a Gaussian prime (since it is of the form )
- A happy prime
- A Higgs prime
- A Kynea prime ()
- A lucky prime
- A permutable prime, with ninety-seven
- A Pillai prime, because 23! + 1 is divisible by 79, but 79 is not one more than a multiple of 23
- A regular prime
- A prime in a residue classes 4n+3, 8n+7, and 10n+9
- A right-truncatable prime, because when the last digit (9) is removed, the remaining number (7) is still prime
- A sexy prime (with 73)
- The n value of the Wagstaff prime 201487636602438195784363
In science
The atomic number of the chemical element gold (Au) is 79.
In astronomy
- Messier object 79 (M79), a magnitude 8.5 globular cluster in the constellation Lepus
- New General Catalogue object 79 (NGC 79), a galaxy in the constellation Andromeda
- Saros series 79, which began on -434 May 21 and ended on 828 June 16, lasting 1262.1 years, and with 71 lunar eclipses
- Saros series 79, which began on -150 February 16 and ended on 1166 April 12, lasting 1316.2 years, and with 74 lunar eclipses
In other fields
- Live Seventy Nine, an album by Hawkwind
- The years 79 AD (or CE), 79 BC(E), or 1979
- Any of several highways numbered 79
- The record cumulative weeks at #1 on the Billboard charts, held by Elvis Presley
- The number of the French department Deux-Sèvres
References
43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.
- ↑ H. Cohen, A Course in Computational Algebraic Number Theory, GTM 138, Springer Verlag (1993), Appendix B2, p.507. The table lists fields by discriminant, which is 4p for Q[√p] when p is congruent to 3 modulo 4, as is the case for 79, so the entry appears at discriminant 316.