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

Revision as of 09:49, 16 February 2014