View source for 230 (number)

{{short description|Number}}
{{Infobox number
| number = 230
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'''230''' ('''two hundred [and] thirty''') is the [[Natural number|natural number]] following [[229 (number)|229]] and preceding [[231 (number)|231]].

Additionally, 230 is:
*a [[Composite number|composite number]], with its divisors being 2, 5, 10, 23, 46, and 115.
*a [[Sphenic number|sphenic number]]<ref>{{cite web|title=Sloane's A007304 : Sphenic numbers|url=https://oeis.org/A007304|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-09-05}}</ref> because it is the product of 3 primes. It is also the first sphenic number to immediately precede another sphenic number.
*[[Palindromic number|palindromic]] and a [[Repdigit|repdigit]] in bases 22 (AA<sub>22</sub>), 45 (55<sub>45</sub>), 114 (22<sub>114</sub>), 229 (11<sub>229</sub>)
*a [[Harshad number]] in bases 2, 6, 10, 12, 23 (and 16 other bases).
*a [[Happy number|happy number]].<ref>{{cite web|title=Sloane's A007770 : Happy numbers|url=https://oeis.org/A007770|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-09-05}}</ref>
*a [[Nontotient|nontotient]]<ref>{{cite web|title=Sloane's A005277 : Nontotients|url=https://oeis.org/A005277|website=The On-Line Encyclopedia of Integer Sequences|publisher=OEIS Foundation|access-date=2016-09-05}}</ref> since there is no integer with 230 coprimes below it.
*the sum of the coprime counts for the first 27 integers.
*the [[Aliquot sum|aliquot sum]] of both 454 and 52441.
*part of the 41-aliquot tree.
*the maximal number of pieces that can be obtained by cutting an annulus with 20 cuts.<ref>{{cite OEIS|A000096|a(n) {{=}} n*(n+3)/2}}</ref>

The aliquot sequence starting at 224 is: 224, 280, 440, 640, 890, 730, 602, 454, '''230''', 202, 104, 106, 56, 64, 63, 41, 1, 0.

There are 230 unique [[Space group|space group]]s describing all possible crystal symmetries.

==Integers between 231 and 239==

=== 231 ===

{{Main|231 (number)}}

=== 232 ===

{{Main|232 (number)}}

=== 233 ===

{{Main|233 (number)}}

=== 234 ===

{{Main|234 (number)}}

=== 235 ===

{{Main|235 (number)}}

=== 236 ===

{{Main|236 (number)}}

=== 237 ===

{{Main|237 (number)}}

=== 238 ===

{{Main|238 (number)}}

=== 239 ===

{{Main|239 (number)}}

==References==
{{Reflist}}


{{DEFAULTSORT:230 (Number)}}
[[Category:Integers]]



{{Sourceattribution|230 (number)}}