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− | {{Infobox |
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− | |title = 71 |
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− | |image = 71.png |
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− | |imagewidth = 200 |
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− | |roman-number = LXXI |
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− | |ordinal-number = seventy first|previous = [[67|<font color="white">67</font>]] |
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− | |next = [[73|<font color="white">73</font>]]}} |
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− | 71 is a [http://prime-numbers.wikia.com/wiki/1-100 prime number from 1-100]. 71 has 2 factors, 1 and 71. It is the twentieth prime number, and the twentieth prime number from 1-100. |
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− | ==Proofs== |
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− | *1 can divide 71 |
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− | *2 cannot |
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− | *3 cannot |
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− | *4 - 70 cannot |
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− | *71 can! |
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− | ==Relationship with other odd numbers== |
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− | ===The numbers before=== |
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− | *The previous odd number, 69, is not a prime number. It is divisible by 3. |
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− | *The odd number previous to 69 is 67. 67 is a prime number. |
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− | **67 and 71 are four numbers apart; therefore, they are cousin primes. |
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− | *The odd number previous to 67 is 65. 65 is not a prime number. It is divisible by 5. |
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− | ===The numbers after=== |
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− | *The next odd number, 73, is a prime number. |
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− | **There are no odd numbers between 71 and 73. As a result, they are twin primes. |
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− | *75, the odd number following 73, is not a prime number. It is divisible by 5. |
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− | *77, the odd number following 75, is also not a prime number. It is divisible by 7. |
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− | *79 is the next prime number after 73. |
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− | {{Navbox_primes}} |
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[[Category:Prime Numbers]] |
[[Category:Prime Numbers]] |
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[[Category:Prime numbers from 1-100]] |
[[Category:Prime numbers from 1-100]] |

## Revision as of 11:43, December 17, 2013

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