|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.

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.