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(Divisibility Rules link)
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{{Infobox
 
|title = 3
 
|image = 3.png
 
|imagewidth = 200
 
|roman-number = III
 
|ordinal-number = third
 
|cardinal-number = three
 
|Base-2 Form = 11
 
|Base-8 Form = 3
 
|Base-16 Form = 3
 
|previous = [[2|<font color="white">2</font>]]
 
|next = [[5|<font color="white">5</font>]]}}
 
   
3 is the second prime number, and the second single digit prime number. 3's prime factors are 1 and 3. It is said to be the first odd prime, because the previous prime number is [[2]], which is even.
 
 
==Proofs==
 
*It is [[Divisibility Rules|divisible by]] 1: 3/1=3
 
*It is '''not '''divisible by {{2}}: 3/2=1.5
 
*It is divisible by {{3}}: 3/3=1
 
*Therefore it has 2 factors, not 3, because 3 divided by 2 does not result in an [[integer]] value.
 
 
==Relationship with other odd numbers==
 
===The numbers before===
 
*2 is the first prime number. It is the only '''even''' prime number.
 
*'''1''', the number before 2, is '''not '''a prime number.
 
===The numbers after===
 
*The next odd number, [[5]], is a prime number.
 
**There are no odd numbers between 3 and 5. As a result, they are twin primes.
 
*[[7]], the odd number following 5, is a prime number.
 
**3 and 7 are four numbers apart, therefore, they are cousin primes.
 
*9, the odd number following 7, is not a prime number. It is a square number, and the first odd composite number.
 
 
==Usage==
 
 
===General===
 
* Trilogy refers to a set of three works of art that are connected, either as a single work or three individual works.
 
===Science===
 
*Lithium's atomic number and number of electrons are 3.
 
*Group three elements also have the valence of +3. Similarly, group five elements have the valence of -3.
 
*Tritium / hydrogen-3, has a nucleon number of 3.
 
===Sports===
 
*In basketball, a shot behind the three-point arc is worth three points, unless in the 3x3 variant.
 
* In baseball, 3 strikes are required for the player to be considered "out", and 3 outs are required for the attacking team to exchange with the opposing team.
 
===Video Games===
 
*In The Legend of Zelda series, there is a sacred relic called Triforce, which consists of three separate golden triangles.
 
 
[[tl:3]]
 
{{Navbox primes}}
 
 
[[Category:Prime numbers from 1-100| 3]]
 
[[Category:Prime numbers from 1-100| 3]]
 
[[Category:Prime Numbers]]
 
[[Category:Prime Numbers]]

Revision as of 13:05, February 15, 2014

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