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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}} |
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[[Category:Prime numbers from 1-100]] |
[[Category:Prime numbers from 1-100]] |
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[[Category:Prime Numbers]] |
[[Category:Prime Numbers]] |

## Revision as of 11:41, December 17, 2013

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