Dalek-James (wall | contribs) (Adding categories) |
(Replaced content with " Category:Prime numbers from 1-100 Category:Prime Numbers Category:2-Digit Prime Numbers Category:Twin Primes") |
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− | {{Infobox |
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− | |title = 31 |
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− | |image = 31.png |
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− | |imagewidth = 200 |
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− | |roman-number = XXXI |
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− | |ordinal-number = thirty first |
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− | |cardinal-number = thirty-one |
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− | |Base-2 Form = 11111 |
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− | |Base-8 Form = 37 |
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− | |Base-16 Form = 1F |
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− | |previous = [[29|<font color="white">29</font>]] |
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− | |next = [[37|<font color="white">37</font>]]}} |
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− | 31 is a [[1-100|prime number from 1-100]]. 31 has 2 factors, 1 and 31. It is said to be a number wherein when digits are added together, they make a composite number. It is the eleventh prime number, and the eleventh prime number from 1-100. [[File:31.png|thumb]] |
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− | ==Proofs== |
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− | *1 can divide 31 |
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− | *2 cannot |
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− | *3 cannot |
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− | *4 - 28 cannot |
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− | *29 cannot |
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− | *30 also cannot |
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− | *31 can divide itself |
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− | ==Relationship with other odd numbers== |
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− | ===The numbers before=== |
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− | *The previous odd number, 29, is a prime number. |
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− | **There are no odd numbers between 29 and 31. As a result, they are twin primes. |
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− | *Before 29, the previous two odd numbers are 25 and 27. 25 is a square number, being 5<sup>2</sup> = 25. 27 is a cube number, being 3<sup>3</sup> = 27. |
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− | *The prime number previous to 29 is 23. |
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− | ===The numbers after=== |
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− | *The next odd number, 33, is '''not''' a prime number. It is divisible by 3 and 11. |
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− | *The next odd number, 35, is also '''not''' a prime number. It is divisible by 5 and 7. |
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− | *37, the odd number following 35, is a prime number. |
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− | **31 and 37 are six numbers apart; therefore, they are sexy primes. |
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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 13:12, February 15, 2014

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