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{{Infobox number
This is a preview for the new '''MathML rendering mode''' (with SVG fallback), which is availble in production for registered users.
| number = 257
| prime = yes
}}
'''257''' is the natural number between [[256 (number)|256]] and 258. It is also a [[prime number]].


==In mathematics==
If you would like use the '''MathML''' rendering mode, you need a wikipedia user account that can be registered here [[https://en.wikipedia.org/wiki/Special:UserLogin/signup]]
257 is a [[prime number]] of the form <math>2^{2^n}+1,</math> specifically with ''n'' = 3, and therefore a [[Fermat prime]]. Thus a [[regular polygon]] with 257 sides is [[constructible polygon|constructible]] with compass and unmarked straightedge.  It is currently the second largest known Fermat prime. <ref>{{citation|title=Elementary Theory of Numbers|last=Hsiung|first=C. Y.|publisher=Allied Publishers|year=1995|isbn=9788170234647|pages=39–40|url=https://encrypted.google.com/books?id=Bfvbx85FkVQC&pg=PA39}}.</ref>
* Only registered users will be able to execute this rendering mode.
* Note: you need not enter a email address (nor any other private information). Please do not use a password that you use elsewhere.


It is also
Registered users will be able to choose between the following three rendering modes:
a [[balanced prime]],<ref>{{SloanesRef|A006562|name=Balanced primes}}</ref>
an [[irregular prime]],<ref>{{SloanesRef|A000928|name=Irregular primes}}</ref>
a prime that is one more than a square,<ref>{{SloanesRef|A002496|name=Primes of form n^2 + 1}}</ref>
and a [[Jacobsthal number#Jacobsthal-Lucas numbers|Jacobsthal–Lucas number]],<ref>{{SloanesRef|A014551|name=Jacobsthal-Lucas numbers}}</ref>


There are exactly 257 combinatorially distinct [[convex polyhedron|convex polyhedra]] with eight [[vertex (geometry)|vertices]] (or [[polyhedral graph]]s with eight nodes).<ref>{{SloanesRef|A000944|name=Number of polyhedra (or 3-connected simple planar graphs) with n nodes}}</ref>
'''MathML'''
:<math forcemathmode="mathml">E=mc^2</math>


==In other fields==
<!--'''PNG''' (currently default in production)
'''257''' is the country calling code for [[Burundi]]. See [[List of country calling codes]].
:<math forcemathmode="png">E=mc^2</math>


==References==
'''source'''
{{reflist}}
:<math forcemathmode="source">E=mc^2</math> -->


{{Integers|2}}
<span style="color: red">Follow this [https://en.wikipedia.org/wiki/Special:Preferences#mw-prefsection-rendering link] to change your Math rendering settings.</span> You can also add a [https://en.wikipedia.org/wiki/Special:Preferences#mw-prefsection-rendering-skin Custom CSS] to force the MathML/SVG rendering or select different font families. See [https://www.mediawiki.org/wiki/Extension:Math#CSS_for_the_MathML_with_SVG_fallback_mode these examples].


{{DEFAULTSORT:257 (Number)}}
==Demos==
[[Category:Integers]]
 
Here are some [https://commons.wikimedia.org/w/index.php?title=Special:ListFiles/Frederic.wang demos]:
 
 
* accessibility:
** Safari + VoiceOver: [https://commons.wikimedia.org/wiki/File:VoiceOver-Mac-Safari.ogv video only], [[File:Voiceover-mathml-example-1.wav|thumb|Voiceover-mathml-example-1]], [[File:Voiceover-mathml-example-2.wav|thumb|Voiceover-mathml-example-2]], [[File:Voiceover-mathml-example-3.wav|thumb|Voiceover-mathml-example-3]], [[File:Voiceover-mathml-example-4.wav|thumb|Voiceover-mathml-example-4]], [[File:Voiceover-mathml-example-5.wav|thumb|Voiceover-mathml-example-5]], [[File:Voiceover-mathml-example-6.wav|thumb|Voiceover-mathml-example-6]], [[File:Voiceover-mathml-example-7.wav|thumb|Voiceover-mathml-example-7]]
** [https://commons.wikimedia.org/wiki/File:MathPlayer-Audio-Windows7-InternetExplorer.ogg Internet Explorer + MathPlayer (audio)]
** [https://commons.wikimedia.org/wiki/File:MathPlayer-SynchronizedHighlighting-WIndows7-InternetExplorer.png Internet Explorer + MathPlayer (synchronized highlighting)]
** [https://commons.wikimedia.org/wiki/File:MathPlayer-Braille-Windows7-InternetExplorer.png Internet Explorer + MathPlayer (braille)]
** NVDA+MathPlayer: [[File:Nvda-mathml-example-1.wav|thumb|Nvda-mathml-example-1]], [[File:Nvda-mathml-example-2.wav|thumb|Nvda-mathml-example-2]], [[File:Nvda-mathml-example-3.wav|thumb|Nvda-mathml-example-3]], [[File:Nvda-mathml-example-4.wav|thumb|Nvda-mathml-example-4]], [[File:Nvda-mathml-example-5.wav|thumb|Nvda-mathml-example-5]], [[File:Nvda-mathml-example-6.wav|thumb|Nvda-mathml-example-6]], [[File:Nvda-mathml-example-7.wav|thumb|Nvda-mathml-example-7]].
** Orca: There is ongoing work, but no support at all at the moment [[File:Orca-mathml-example-1.wav|thumb|Orca-mathml-example-1]], [[File:Orca-mathml-example-2.wav|thumb|Orca-mathml-example-2]], [[File:Orca-mathml-example-3.wav|thumb|Orca-mathml-example-3]], [[File:Orca-mathml-example-4.wav|thumb|Orca-mathml-example-4]], [[File:Orca-mathml-example-5.wav|thumb|Orca-mathml-example-5]], [[File:Orca-mathml-example-6.wav|thumb|Orca-mathml-example-6]], [[File:Orca-mathml-example-7.wav|thumb|Orca-mathml-example-7]].
** From our testing, ChromeVox and JAWS are not able to read the formulas generated by the MathML mode.
 
==Test pages ==
 
To test the '''MathML''', '''PNG''', and '''source''' rendering modes, please go to one of the following test pages:
*[[Displaystyle]]
*[[MathAxisAlignment]]
*[[Styling]]
*[[Linebreaking]]
*[[Unique Ids]]
*[[Help:Formula]]
 
*[[Inputtypes|Inputtypes (private Wikis only)]]
*[[Url2Image|Url2Image (private Wikis only)]]
==Bug reporting==
If you find any bugs, please report them at [https://bugzilla.wikimedia.org/enter_bug.cgi?product=MediaWiki%20extensions&component=Math&version=master&short_desc=Math-preview%20rendering%20problem Bugzilla], or write an email to math_bugs (at) ckurs (dot) de .

Latest revision as of 23:52, 15 September 2019

This is a preview for the new MathML rendering mode (with SVG fallback), which is availble in production for registered users.

If you would like use the MathML rendering mode, you need a wikipedia user account that can be registered here [[1]]

  • Only registered users will be able to execute this rendering mode.
  • Note: you need not enter a email address (nor any other private information). Please do not use a password that you use elsewhere.

Registered users will be able to choose between the following three rendering modes:

MathML


Follow this link to change your Math rendering settings. You can also add a Custom CSS to force the MathML/SVG rendering or select different font families. See these examples.

Demos

Here are some demos:


Test pages

To test the MathML, PNG, and source rendering modes, please go to one of the following test pages:

Bug reporting

If you find any bugs, please report them at Bugzilla, or write an email to math_bugs (at) ckurs (dot) de .

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