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On December 6, {{year|2020}}, [[John Winston Garth]] found a small period-21 tagalong for a single weekender, which in its simplest phase consists entirely of two [[R-pentomino]] descendants.<ref name="post114481" /><ref name="post114488" /> The spaceship was found using a combination of [[ikpx2]] and [[apgsearch]], with partial results from the former being inputted into the latter via ikpx2's "standard input" feature, with the goal of searching higher-period spaceships and [[puffer]]s. Garth settled on the name "doo-dah" for the tagalong.<ref name="message785223433708503091" />
On December 6, {{year|2020}}, [[John Winston Garth]] found [[doo-dah]], a small period-21 tagalong for a single weekender, which in its simplest phase consists entirely of two [[R-pentomino]] descendants.<ref name="post114481" /><ref name="post114488" /> The spaceship was found using a combination of [[ikpx2]] and [[apgsearch]], with partial results from the former being inputted into the latter via ikpx2's "standard input" feature, with the goal of searching higher-period spaceships and [[puffer]]s. Garth settled on the name "doo-dah" for the tagalong.<ref name="message785223433708503091" />
 
A [[beehive]] puffer based on this spaceship was found the same day, seemingly independently by [[iNoMed]]<ref name="message785159676852437022" /> and [[GUYTU6J]].<ref name="post114486" /> GUYTU6J also found a [[block]] puffer formed by adding a second weekender to the side of the p21 ship.<ref name="post114486" /> Both of these puffers can be either one- or two-sided. Various glider [[rake]]s have also been constructed.<ref name="post114499" /><ref name="message785367903423299584" />
 
[[Goldtiger997]] found that the p21 tagalong could be added to the weekender with six gliders,<ref name="message785163782263275570" /><ref name="post114488" /> while iNoMed found that each side could be turned into a beehive puffer with two gliders.<ref name="message785171481218514994" /><ref name="post114488" /> Finally, [[gooddogtyson]] and [[Blinkerspawn]] found that the p21 ship could be converted both to and from a puffer with just one glider each way, on each side.<ref name="message785183593814556672" /><ref name="message785184425607561247" />
 
{|
|-
| {{EmbedViewer
|pname        = weekenderaddp21tagalong
|caption      = p21 tagalong being added with six gliders<br>
|position    = center
}}
|| {{EmbedViewer
|pname        = weekenderp21addremovepuffer
|caption      = Beehive puffer reaction being added to one side and removed from the other<br>
|position    = center
}}
|}


==See also==
==See also==
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}}</ref>
}}</ref>
<ref name="message785223433708503091">{{CiteDiscord
<ref name="message785223433708503091">{{CiteDiscord
|author  = winston
|author  = John Winston Garth
|date    = December 6, 2020
|date    = December 6, 2020
|channel = cgol
|channel = cgol
|id      = 785223433708503091
|id      = 785223433708503091
}}</ref>
<ref name="post114486">{{LinkForumThread
|format = ref
|title  = Re: Thread For Your Useless Discoveries
|p      = 114486
|author = GUYTU6J
|date  = December 6, 2020
}}</ref>
<ref name="message785159676852437022">{{CiteDiscord
|author  = iNoMed
|date    = December 6, 2020
|channel = cgol
|id      = 785159676852437022
}}</ref>
<ref name="post114499">{{LinkForumThread
|format = ref
|title  = Re: Spaceship Discussion Thread
|p      = 114499
|author = Aidan F. Pierce
|date  = December 6, 2020
}}</ref>
<ref name="message785367903423299584">{{CiteDiscord
|author  = strix421
|date    = December 6, 2020
|channel = cgol
|id      = 785367903423299584
}}</ref>
<ref name="message785163782263275570">{{CiteDiscord
|author  = Goldtiger997
|date    = December 6, 2020
|channel = cgol
|id      = 785163782263275570
}}</ref>
<ref name="message785171481218514994">{{CiteDiscord
|author  = iNoMed
|date    = December 6, 2020
|channel = cgol
|id      = 785171481218514994
}}</ref>
<ref name="message785183593814556672">{{CiteDiscord
|author  = gooddogtyson
|date    = December 6, 2020
|channel = cgol
|id      = 785183593814556672
}}</ref>
<ref name="message785184425607561247">{{CiteDiscord
|author  = Blinkerspawn
|date    = December 6, 2020
|channel = cgol
|id      = 785184425607561247
}}</ref>
}}</ref>
</references>
</references>

Revision as of 14:11, 7 December 2020

Weekender
#N Weekender #O David Eppstein #C An orthogonal period 7 spaceship with speed 2c/7. #C www.conwaylife.com/wiki/Weekender x = 16, y = 11, rule = B3/S23 bo12bo$bo12bo$obo10bobo$bo12bo$bo12bo$2bo3b4o3bo$6b4o$2b4o4b4o2$4bo6bo $5b2o2b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 7 TRACKLOOP 7 0 -2/7 THUMBSIZE 2 ]]
View animated image
View static image
Pattern type Spaceship
Number of cells 36
Bounding box 18 × 12
Direction Orthogonal
Period 7 (mod: 7)
Speed 2c/7 | 2c/7
Heat 45.1
Kinetic symmetry Unspecified
Discovered by David Eppstein
Year of discovery 2000

Weekender is a 2c/7 orthogonal spaceship that was found by David Eppstein on January 12, 2000.[1] Before the discovery of scholar in 2019, n weekenders pulling n-1 tagalongs constituted the only known spaceships with speed 2c/7, besides self-sustaining loops of weekender conduits. These were the only known period-7 spaceships until the discovery of lobster in 2011, loafer in 2013 and spaghetti monster in 2016.

Despite the relative simplicity of its components, a glider synthesis for the weekender had been elusive since its discovery. A weekender synthesis was completed on January 25, 2015, 15 years after its discovery (and coincidentally, on a weekend).[2] On September 26, 2015, Chris Cain announced a p444 weekender gun based on a 79-glider synthesis, as well as a p451/p457+ glider-to-weekender converter.[3]

Tagalongs

On April 27, 2000, Stephen Silver found a tagalong for a pair of weekenders, as shown below.

Two weekenders followed by a tagalong
RLE: here

On December 6, 2020, John Winston Garth found doo-dah, a small period-21 tagalong for a single weekender, which in its simplest phase consists entirely of two R-pentomino descendants.[4][5] The spaceship was found using a combination of ikpx2 and apgsearch, with partial results from the former being inputted into the latter via ikpx2's "standard input" feature, with the goal of searching higher-period spaceships and puffers. Garth settled on the name "doo-dah" for the tagalong.[6]

See also

References

  1. ↑ Jason Summers' jslife pattern collection.
  2. ↑ Martin Grant (January 25, 2015). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
  3. ↑ Chris Cain (September 26, 2015). Re: Small Spaceship Syntheses (discussion thread) at the ConwayLife.com forums
  4. ↑ yujh (December 6, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  5. ↑ Aidan F. Pierce (December 6, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  6. ↑ John Winston Garth (December 6, 2020). Message in #cgol on the Conwaylife Lounge Discord server


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