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− | {{Infobox |
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− | |title = 23 |
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− | |image = 23.png |
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− | |imagewidth = 200 |
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− | |roman-number = XXIII |
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− | |ordinal-number = twenty third |
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− | |cardinal-number = twenty three |
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− | |Base-2 Form = 10111 |
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− | |Base-8 Form = 27 |
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− | |Base-16 Form = 17 |
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− | |previous = [[19|<font color="white">19</font>]] |
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− | |next = [[29|<font color="white">29</font>]]}} |
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− | 23 is a [[1-100|prime number from 1-100]]. 23 has two factors, 1 and 23. 23 is said to also be one of the numbers that when you add up its digits, you get a prime number. It is the ninth prime number, and the ninth prime number from 1-100. |
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− | ==Proofs== |
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− | *1 can divide 23 |
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− | *2 cannot |
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− | *3 cannot |
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− | *4 cannot |
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− | *5 cannot |
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− | *...22 cannot |
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− | *23 can divide itself |
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− | ==Relationships with other odd numbers== |
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− | ===The numbers before=== |
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− | *The previous odd number, 21, is not a prime number. It is divisible by 3 and 7. |
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− | *The odd number previous to 21 is 19. 19 is a prime number. |
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− | **19 and 23 are four numbers apart; therefore, they are cousin primes. |
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− | *The odd number previous to 19 is 17. 17 is a prime number. |
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− | **17 and 23 are six numbers apart; therefore, they are sexy primes. |
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− | ===The numbers after=== |
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− | *The next odd number, 25, is not a prime number. It is a square number, being 5<sup>2</sup> = 25. |
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− | *27, the odd number following 25, is not a prime number. It is a cube number, being 3<sup>3</sup> = 27. |
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− | *29, the odd number following 27, is a prime number. |
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− | **23 and 29 are six numbers apart; therefore, they are sexy primes. |
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− | *Due to the fact that 23 is not part of any twin numbers, it is considered an isolated prime. |
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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]] |