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| {{Unreferenced|date=December 2009}}
| | The name of the writer is Jayson. To play domino is something I really appreciate doing. Credit authorising is where my main earnings comes from. Kentucky is exactly where I've always been living.<br><br>Here is my homepage ... love psychic readings ([http://formalarmour.com/index.php?do=/profile-26947/info/ formalarmour.com]) |
| {{Infobox number
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| | number = 257
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| | prime = yes
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| '''257''' is the natural number between [[256 (number)|256]] and 258. It is also a [[prime number]].
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| ==In mathematics==
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| 257 is a [[prime number]] of the form <math>2^{2^3}+1</math> 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. It is also a [[Proth prime]]. And since it is of the form 4''n'' + 1, it is a [[Pythagorean prime]].
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| It is also an [[irregular prime]], and a [[Full reptend prime|long prime]] (in base 10) and a [[balanced prime]]. Since the next prime, 263, is 6 away, 257 is called a [[sexy prime]].
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| Since 257 + 2 = 259, a semiprime, 257 is a [[Chen prime]]. It is also an [[Eisenstein prime]] with no imaginary part, and a [[Pierpont prime]].
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| 257 is the hypotenuse of a primitive [[Pythagorean triple]]:
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| <math>257^{2} = 32^{2}+255^{2}</math>
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| ==In other fields==
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| '''257''' is the country calling code for [[Burundi]]. See [[List of country calling codes]].
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| {{Integers|2}}
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| {{DEFAULTSORT:257 (Number)}}
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| [[Category:Integers]]
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Revision as of 19:18, 21 February 2014
The name of the writer is Jayson. To play domino is something I really appreciate doing. Credit authorising is where my main earnings comes from. Kentucky is exactly where I've always been living.
Here is my homepage ... love psychic readings (formalarmour.com)