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{{Oscillator|name=28P7.2|pname=28p7.2|c=28|p=7|bx=12|by=11|h=5.1|discoverer=Dean Hickerson|discoveryear=1998|animated=yes|life105=true|life106=true|plaintext=true|rle=true|synthesis=22|synthesisRLE=true|v=0.42|rulemin=B3/S23|rulemax=B378/S23678|rulespecial=[[Conway's Game of Life|Conway's Life]], DryLife}}
{{Oscillator
'''28P7.2''' is an unnamed [[period]] [[:Category:Oscillators with period 7|7]] [[oscillator]] discovered by [[Dean Hickerson]] in [[:Category:patterns found in 1998|1998]]. In terms of its 28 [[cell]]s, it is tied with oscillators [[burloaferimeter]] and [[28P7.1]] as the smallest known period 7 oscillator.<ref>{{cite web|url=http://pentadecathlon.com/objects/class2/class2.php?part=2 |title=Class 2 Objects Catalog |accessdate=March 14, 2009}}</ref> In September, [[:Category:patterns found in 2000|2000]] [[Mark Niemiec]] and [[Jason Summers]] found a [[:Category:patterns that can be constructed with 22 gliders|22]]-[[glider]] [[Glider synthesis|synthesis]] of this oscillator.<ref>{{CiteSummersPattern|name=jslife}}</ref>
|name             = 28P7.2
|pname           = 28p7.2
|c               = 28
|bx               = 12
|by               = 11
|p                = 7
|m                = 7
|h               = 5.1
|v                = 0.42
|sv              = 0.42
|symmetry        = .e
|discoverer       = Dean Hickerson
|discoveryear     = 1998
|rulemin          = B3/S23
|rulemax          = B378/S23678
|isorulemin      = B3aceiy/S2-in3-ak
|isorulemax      = B2n34ceqtwz5aek6-k78/S234-jn5-ky678
|synthesis        = 16
|synthesisRLE    = true
|plaintext       = true
|rle             = true
|apgcode          = xp7_o8y2gbdz0dl31w11156z011
|pentadecathlonid = 28P7.2
|animated        = yes
|viewerconfig    = #C [[ GPS 2 LOOP 7 THUMBSIZE 2 ZOOM 20 ]]
}}
'''28P7.2''' is an unnamed {{period|7}} [[oscillator]] discovered by [[Dean Hickerson]] in {{year|1998}}. In terms of its 28 [[cell]]s, it is tied with oscillators [[burloaferimeter]], [[28P7.1]], and [[28P7.3]] as the smallest known period 7 oscillator.<ref>{{cite web|url=http://pentadecathlon.com/objects/class2/class2.php?part=2 |title=Class 2 Objects Catalog |accessdate=March 14, 2009}}</ref> In September, {{year|2000}} [[Mark Niemiec]] and [[Jason Summers]] found a {{gliders|22}} [[synthesis]] of this oscillator.<ref>{{CiteSummersPattern|name=jslife}}</ref>


==References==
A [[stator]] variant of this oscillator appeared [[semi-natural]]ly on October 28, {{year|2018}}, in a [[symmetric]] [[soup]] submitted to [[Catagolue]] by [[carybe]],<ref name="post67318" /> and the canonical variant first appeared on August 12, 2022, in a symmetric soup by the [[Open Science Grid]].<ref>{{cata|attribute/xp7_o8y2gbdz0dl31w11156z011/b3s23/C2_2|attribute page}}, {{cata|hashsoup/G2_2/o_ujThHK5FtU7F14976668/b3s23|the soup in question}}</ref>
<references />
 
[[Category:Patterns with S2 symmetry]]
== See also ==
* [[37P10.1]]
* [[Eater bridge eater]], the catalyst this oscillator is based on
 
== References ==
<references>
<ref name="post67318">{{LinkForumThread
|format = ref
|title  = Re: Soup search results
|p      = 67318
|author = Park Shinhwan
|date  = January 6, 2019
}}</ref>
</references>
 
== External links ==
{{LinkCatagolue|xp7_o8y2gbdz0dl31w11156z011}}
{{LinkPentadecathlonObject|28P7.2}}
* [https://catagolue.hatsya.com/census/b3s23/C2_2/xp7 All semi-natural stator variants of 28P7.2 (Catagolue)]
 
[[Category:Unnamed periodic objects]]

Latest revision as of 23:41, 17 January 2026

28P7.2
x = 12, y = 11, rule = B3/S23 b2o9b$2bo9b$bo10b$b2o7b2o$3bo4bo2bo$b2o2b2o2b2ob$o2bo4bo3b$2o7b2ob$10b ob$9bo2b$9b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 2 LOOP 7 THUMBSIZE 2 ZOOM 20 ]]
View animated image
View static image
Pattern type Oscillator
Number of cells 28
Bounding box 12 × 11
Period 7 (mod: 7)
Heat 5.1
Volatility 0.42 | 0.42
Kinetic symmetry .e
Discovered by Dean Hickerson
Year of discovery 1998

28P7.2 is an unnamed period-7 oscillator discovered by Dean Hickerson in 1998. In terms of its 28 cells, it is tied with oscillators burloaferimeter, 28P7.1, and 28P7.3 as the smallest known period 7 oscillator.[1] In September, 2000 Mark Niemiec and Jason Summers found a 22-glider synthesis of this oscillator.[2]

A stator variant of this oscillator appeared semi-naturally on October 28, 2018, in a symmetric soup submitted to Catagolue by carybe,[3] and the canonical variant first appeared on August 12, 2022, in a symmetric soup by the Open Science Grid.[4]

See also

References

  1. ↑ "Class 2 Objects Catalog". Retrieved on March 14, 2009.
  2. ↑ Jason Summers' jslife pattern collection.
  3. ↑ Park Shinhwan (January 6, 2019). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  4. ↑ attribute page, the soup in question
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