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==Tagalongs==
==Tagalongs==
On April 27, 2000, [[Stephen Silver]] found a [[tagalong]] for a pair of weekenders, as shown below. On December 5, {{year|2020}}, winston found another tagalong with period 21 consisting of two [[R-pentomino]]es. [[Goldtiger997]] soon found a 6-glider recipe that adds the tagalong to a weekender.
On April 27, 2000, [[Stephen Silver]] found a [[tagalong]] for a pair of weekenders, as shown below.
{|
{|
|-
|-
|[[Image:weekender_tagalong.png|framed|left|Two weekenders followed by a tagalong<br />{{JavaRLE|weekendertagalong|brief}}]]
|[[Image:weekender_tagalong.png|framed|left|Two weekenders followed by a tagalong<br />{{JavaRLE|weekendertagalong|brief}}]]
|}
|}
On December 6, {{year|2020}}, [[winstax]] found a small period-21 tagalong for the 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.
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.
[[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 each.<ref name="message785171481218514994" /><ref name="post114488" />


==See also==
==See also==
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|author    = Chris Cain
|author    = Chris Cain
|date      = September 26, 2015
|date      = September 26, 2015
}}</ref>
<ref name="post114481">{{LinkForumThread
|format = ref
|title  = Re: Spaceship Discussion Thread
|p      = 114481
|author = yujh
|date  = December 6, 2020
}}</ref>
<ref name="post114488">{{LinkForumThread
|format = ref
|title  = Re: Spaceship Discussion Thread
|p      = 114488
|author = Aidan F. Pierce
|date  = December 6, 2020
}}</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="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>
</references>
</references>
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{{LinkEppstein|14105|patternname=The Weekender (glider 14105)}}
{{LinkEppstein|14105|patternname=The Weekender (glider 14105)}}
{{LinkCatagolue|xq7_7dfxg88gxfd7zw123u2222u321}}
{{LinkCatagolue|xq7_7dfxg88gxfd7zw123u2222u321}}
{{LinkCatagolue|xq21_7dfxg88gxfd7zw123u2222u321zzweh1r4w4r1hezssoy6ossz12y821|patternname=Weekender w/ p21 tagalong}}
{{LinkPentadecathlonObject|36P7H2V0.1}}
{{LinkPentadecathlonObject|36P7H2V0.1}}


Revision as of 16:37, 6 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, winstax found a small period-21 tagalong for the 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.

A beehive puffer based on this spaceship was found the same day, seemingly independently by iNoMed[6] and GUYTU6J.[7] GUYTU6J also found a block puffer formed by adding a second weekender to the side of the p21 ship.[7] Both of these puffers can be either one- or two-sided.

Goldtiger997 found that the p21 tagalong could be added to the weekender with six gliders,[8][5] while iNoMed found that each side could be turned into a beehive puffer with two gliders each.[9][5]

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. ↑ 5.0 5.1 5.2 Aidan F. Pierce (December 6, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  6. ↑ iNoMed (December 6, 2020). Message in #cgol on the Conwaylife Lounge Discord server
  7. ↑ 7.0 7.1 GUYTU6J (December 6, 2020). Re: Thread For Your Useless Discoveries (discussion thread) at the ConwayLife.com forums
  8. ↑ Goldtiger997 (December 6, 2020). Message in #cgol on the Conwaylife Lounge Discord server
  9. ↑ iNoMed (December 6, 2020). Message in #cgol on the Conwaylife Lounge Discord server


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