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

Revision as of 11:47, December 17, 2013

13 is a 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.

13

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.
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