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{{Infobox
 
|title = 13
 
|image = 13.png
 
|imagewidth = 200
 
|roman-number = XIII
 
|ordinal-number = thirteenth
 
|previous = [[11|<font color="white">11</font>]]
 
|next = [[17|<font color="white">17</font>]]}}13 is a [[1-100|prime number from 1-100]]. 13 is prime because it only has 2 factors, 1 and 13. It is said to be an unlucky number, because of some reasons. It is the sixth prime number, and the sixth prime number between 1 to 100.
 
   
[[File:13.png|thumb]]
 
 
==Proofs==
 
 
*1 can be divided by 13
 
*2 to 12 cannot be divided by 13
 
*13 can be divided by itself
 
*Thefore it has 2 factors.
 
==​Relationship with other odd numbers==
 
===The numbers before===
 
*The previous odd number, 11, is a prime number.
 
**There are no odd numbers between 11 and 13. As a result, they are twin primes.
 
*The odd number previous to 11 is 9. 9 is a square number.
 
*The odd number previous to 9 is 7. 7 is a prime number.
 
**7 and 13 are six numbers apart; therefore, they are sexy primes.
 
===The numbers after===
 
*The next odd number, 15, is not a prime number. It is divisible by 3 and 5.
 
*17, the odd number following 15, is a prime number.
 
**13 and 17 are four numbers apart; therefore, they are cousin primes.
 
*19, the odd number following 17, is a prime number.
 
**13 and 19 are six numbers apart; therefore, they are sexy primes.
 
 
==Trivia==
 
*The fear of number 13 is called Triskaidekaphobia, which was founded at 1911.
 
 
{{Navbox primes}}
 
 
[[Category:Prime numbers from 1-100]]
 
[[Category:Prime numbers from 1-100]]
 
[[Category:Prime Numbers]]
 
[[Category:Prime Numbers]]

Revision as of 11:41, December 17, 2013

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