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Line 11: Line 11:
|z                = 2c/7
|z                = 2c/7
|h                = 45.1
|h                = 45.1
|symmetry        = -e
|discoverer      = David Eppstein
|discoverer      = David Eppstein
|discoveryear    = 2000
|discoveryear    = 2000
Line 23: Line 24:
|rle              = true
|rle              = true
|animated        = true
|animated        = true
|viewerconfig    = #C [[ GPS 7 TRACKLOOP 7 0 -2/7 THUMBSIZE 2 ]]
|viewerconfig    = #C [[ GPS 4 TRACKLOOP 7 0 -2/7 THUMBSIZE 2 ]]
|apgcode          = xq7_7dfxg88gxfd7zw123u2222u321
|apgcode          = xq7_7dfxg88gxfd7zw123u2222u321
|pentadecathlonid = 36P7H2V0.1
|pentadecathlonid = 36P7H2V0.1
|eppsteinid      = 14105
|eppsteinid      = 14105
}}
}}
'''Weekender''' is a [[2c/7 orthogonal]] [[spaceship]] that was found by [[David Eppstein]] on January 12, {{year|2000}}.<ref>{{CiteSummersPattern|name=jslife}}</ref> Before the discovery of [[scholar]] in {{year|2019}}, ''n'' weekenders pulling {{nowrap|''n'' &minus; 1}} tagalongs constituted the only known spaceships with [[speed]] 2c/7, besides self-sustaining loops of [[2c/7 orthogonal#Rakes|weekender conduits]]. These were the only known {{periodS|7}} spaceships until the discovery of [[lobster (spaceship)|lobster]] in {{year|2011}}, [[loafer]] in {{year|2013}} and [[spaghetti monster]] in {{year|2016}}.
'''Weekender''' is a [[2c/7 orthogonal]] [[spaceship]] that was found by [[David Eppstein]] on January 12, {{year|2000}}.<ref>{{CiteSummersPattern|name=jslife}}</ref> Before the discovery of [[scholar]] in {{year|2019}}, ''n'' weekenders pulling {{nowrap|''n'' &minus; 1}} tagalongs constituted the only known spaceships with [[speed]] 2c/7, besides self-sustaining loops of [[2c/7 orthogonal#Rakes|weekender conduits]]. These were the only known {{periodS|7}} spaceships until the discovery of [[lobster]] in {{year|2011}}, [[loafer]] in {{year|2013}} and [[spaghetti monster]] in {{year|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, {{year|2015}}, 15 years after its discovery (and coincidentally, on a weekend).<ref name="post16223" /> 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.<ref name="post23009" />  On September 6, 2021, [[iNoMed]] produced a 33-glider recipe<ref>[https://discord.com/channels/357922255553953794/370571014654001154/884500442321666131 33-glider recipe]</ref> based on 35- and 34-glider recipes from a week earlier.
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, {{year|2015}}, 15 years after its discovery (and coincidentally, on a weekend).<ref name="post16223" /> 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.<ref name="post23009" />  On September 6, 2021, [[iNoMed]] produced a 33-glider recipe<ref>[https://discord.com/channels/357922255553953794/370571014654001154/884500442321666131 33-glider recipe]</ref> based on 35- and 34-glider recipes from a week earlier.
A {{gliders|32}} synthesis was found in November 2023.<ref name="j5443374497" /> On February 9, {{year|2024}}, iNoMed reduced the synthesis to {{gliders|29|text=29 gliders}},<ref name="post177656"/><ref name="j6136674566"/> followed by a reduction to {{gliders|28|text=28 gliders}} by KtT the same day.<ref name="post177663"/><ref name="j6139137922"/>
A {{gliders|32}} synthesis was found in November 2023.<ref name="j5443374497" /> On February 9, {{year|2024}}, iNoMed reduced the synthesis to {{gliders|29|text=29 gliders}},<ref name="post177656"/><ref name="j6136674566"/> followed by a reduction to {{gliders|28|text=28 gliders}} by KtT the same day.<ref name="post177663"/><ref name="j6139137922"/>


==Tagalongs==
On March 5, 2026, [[Entity Valkyrie]] constructed a p690 weekender gun, using a synthesis of 27 gliders (with a G-to-beehive catalyst) and an LWSS.<ref>{{LinkForumThread|format=ref|title=Re: Thread For Synthesisable Spaceship Guns|f=2|t=1643|p=226339|author=Entity Valkyrie 2|date=March 5, 2026}}</ref> Notably, it fits in a {{times|294|292}} bounding box, and has less than a third the population of Cain's first gun.
 
== Tagalongs ==
On April 27, 2000, [[Stephen Silver]] found a [[tagalong]] for a pair of weekenders, as shown below.
On April 27, 2000, [[Stephen Silver]] found a [[tagalong]] for a pair of weekenders, as shown below.


Line 42: Line 45:
|caption      = Two weekenders followed by a tagalong
|caption      = Two weekenders followed by a tagalong
|style        = width:300px;
|style        = width:300px;
|apgcode      = xq7_7dfxg88gxfd7y17dfxg88gxfd7zw123u2222u321wa414aw123u2222u321zy922433033422zya3nco0ocn3zyb2430342
}}
}}


Line 48: Line 52:
Soon after, [[Matthias Merzenich]] discovered that a component from the side of [[186P7H2V0]] can attach to a weekender.<ref name="post114802" /> On March 19, {{year|2021}}, Merzenich discovered a width-22 [[symmetric]] tagalong for a single weekender<ref name="post126154" /> and proved that this is the only such period-7 symmetric tagalong at that width.<ref name="post126432" />
Soon after, [[Matthias Merzenich]] discovered that a component from the side of [[186P7H2V0]] can attach to a weekender.<ref name="post114802" /> On March 19, {{year|2021}}, Merzenich discovered a width-22 [[symmetric]] tagalong for a single weekender<ref name="post126154" /> and proved that this is the only such period-7 symmetric tagalong at that width.<ref name="post126432" />


[[Caleb R. Hilton]] found a [[scholar]] with the [[traffic light]] in front removed can act as a [[tagalong]] for a pair of scholars or weekenders. <ref name="post179218" />
In {{year|2024}}, [[Caleb R. Hilton]] found a [[scholar]] with the [[traffic light]] in front removed can act as a [[tagalong]] for a pair of scholars or weekenders.<ref name="post179218" />


{{EmbedViewer
{{gallery top}}
{{gallery item|{{EmbedViewer
|rle = x = 22, y = 76, rule = B3/S23
4bo12bo$4bo12bo$3bobo10bobo$4bo12bo$4bo12bo$5bo3b4o3bo$9b4o$5b4o4b4o2$
7bo6bo$8b2o2b2o2$4bo12bo$3bob2o8b2obo$2b2ob2o8b2ob2o$2b2ob2o8b2ob2o$5b
3o6b3o$5b2o8b2o$5b2o8b2o2$6bo8bo$6b3o4b3o$5bo4b2o4bo$6b2o6b2o2$6b2o6b
2o$8b6o$4b2o2b6o2b2o$3bo2b2o6b2o2bo$4b2o10b2o$2bo2bo10bo2bo$b3ob2o2bo
2bo2b2ob3o$bobobo3bo2bo3bobobo$4b3o2bo2bo2b3o$2b3o4bo2bo4b3o$2bo6b4o6b
o$4b14o$4bo2b2o4b2o2bo3$2b3obo8bob3o$3b2o2bo6bo2b2o$8bo4bo$8b2o2b2o2$
7bo6bo$6b2o6b2o$5bo10bo$9b4o2$10b2o$8bo4bo$6b2o6b2o$4bobo8bobo$3bob3ob
o2bob3obo$2b2o14b2o$2b2obo10bob2o$3b3o10b3o$4bobobo4bobobo$5b2o2bo2bo
2b2o2$3b2obo8bob2o$5b3o6b3o3$4bo12bo$2b2ob2o8b2ob2o$2bo2b2o8b2o2bo$bo
3bo10bo3bo$o5bo8bo5bo$o5bo8bo5bo$bo18bo$2bo3bo8bo3bo$3bobo10bobo$4b2o
10b2o$3b2obo8bob2o!
|viewerconfig = #C [[ HEIGHT 750 WIDTH 500 ZOOM 8 ]]
|position    = center
|caption      = Weekender tagalong by [[Matthias Merzenich]]
|style        = width:300px;
|apgcode      = xq7_wcufecxggxcefuczy0111agmhhmga111zxcigc01y010cgiczy044c8y28c44zy2n08888880nzwgski1y41iksgz37aqikja066660ajkiqa73zw3kmk203y0302kmk3zy0245umowomu542zy124119kk91142zxo4kkiey0eikk4ozy02c87y278c2zx6f78y487f6z02dlg2ty4t2gld2zw730ooy4oo037
}}}}
{{gallery item|{{EmbedViewer
|rle = x = 44, y = 86, rule = B3/S23
|rle = x = 44, y = 86, rule = B3/S23
29bo12bo$28b3o10b3o$28b3o10b3o$b3o10b3o$o3bo8bo3bo$31bo3b2o3bo$4bo8bo
29bo12bo$28b3o10b3o$28b3o10b3o$b3o10b3o$o3bo8bo3bo$31bo3b2o3bo$4bo8bo
Line 68: Line 92:
o$14bob2o11b2obo$23bo$23bo$16b3o3bobo3b3o$23bo$18b2o3bo3b2o$18b2o7b2o
o$14bob2o11b2obo$23bo$23bo$16b3o3bobo3b3o$23bo$18b2o3bo3b2o$18b2o7b2o
$18bobo5bobo$17bo11bo$16b4o7b4o$15bo15bo$15b2ob2o7b2ob2o!
$18bobo5bobo$17bo11bo$16b4o7b4o$15bo15bo$15b2ob2o7b2ob2o!
|viewerconfig = #C [[ THUMBSIZE 2 HEIGHT 600 WIDTH 600 ]]
|viewerconfig = #C [[ HEIGHT 750 WIDTH 500 ZOOM 8 ]]
|position    = center
|position    = center
|caption      = Scholar as weekender tagalong
|caption      = Scholar as weekender tagalong
|style        = width:300px;
|style        = width:300px;
}}
|apgcode      = xq7_x75760kozy2ci0v111zxo8oo0a7111y0gy28siy6goy2ccasogycgox8ooy68gzx111w88k0ksc01d1i606mcc14wsc06s23v3e2u030i203n8s22ascccecc0ggg12466601277w8o405721zyarr0rhhxrr4wh0eraraay0hrarar0rr0hy6r0aa0rey4ehwlz8k24kow22505760gmg9c0cd66g4w760c78ovoe8f0o0980ot2788a7666e660111g84ccc0g8ssw2340ks8gzw11gh2pgey31y2279y613y266a731yc13x233y621zwgg1h8j1ez258453
}}}}
{{gallery bottom}}


==See also==
== See also ==
* [[Weekender distaff]]
* [[Weekender distaff]]


==References==
== References ==
<references>
<references>
<ref name="j5443374497">{{CiteCatagolueJob|job=5443374497|date=November 2, 2023}}</ref>
<ref name="j5443374497">{{CiteCatagolueJob|job=5443374497|date=November 2, 2023}}</ref>
Line 150: Line 176:
|author = KtT
|author = KtT
|date  = February 9, 2024
|date  = February 9, 2024
}}
}}</ref>
<ref name="post179218">{{LinkForumThread
<ref name="post179218">{{LinkForumThread
|format = ref
|format = ref
Line 160: Line 186:
</references>
</references>


 
== External links ==
==External links==
* [http://arxiv.org/abs/cs/0004003 Searching for Spaceships] - Eppstein's paper describing the discovery of the weekender
* [http://arxiv.org/abs/cs/0004003 Searching for Spaceships] - Eppstein's paper describing the discovery of the weekender
* {{LinkLexicon|lex_w.htm#weekender}}
* {{LinkLexicon|lex_w.htm#weekender}}
Line 170: Line 195:


[[Category:Non-monotonic spaceships]]
[[Category:Non-monotonic spaceships]]
{{Symmetry|orthogonal2}}
__NOTOC__
__NOTOC__

Latest revision as of 19:56, 5 March 2026

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 4 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 -e
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] On September 6, 2021, iNoMed produced a 33-glider recipe[4] based on 35- and 34-glider recipes from a week earlier. A 32-glider synthesis was found in November 2023.[5] On February 9, 2024, iNoMed reduced the synthesis to 29 gliders,[6][7] followed by a reduction to 28 gliders by KtT the same day.[8][9]

On March 5, 2026, Entity Valkyrie constructed a p690 weekender gun, using a synthesis of 27 gliders (with a G-to-beehive catalyst) and an LWSS.[10] Notably, it fits in a 294 × 292 bounding box, and has less than a third the population of Cain's first gun.

Tagalongs

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

x = 37, y = 24, rule = B3/S23 bo12bo7bo12bo$bo12bo7bo12bo$obo10bobo5bobo10bobo$bo12bo7bo12bo$bo12bo 7bo12bo$2bo3b4o3bo9bo3b4o3bo$6b4o8bo8b4o$2b4o4b4o2b5o2b4o4b4o$15bobobo bo$4bo6bo13bo6bo$5b2o2b2o6bobo6b2o2b2o$14bo2bobo2bo$14bo2bobo2bo$14bob o3bobo3$14b2o5b2o$14b2o5b2o2$16b2ob2o$15bobobobo$15bobobobo$17bobo$15b 2o3b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ZOOM 8 ]]
Two weekenders followed by a tagalong
(click above to open LifeViewer)
RLE: here Plaintext: here
Catagolue: 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.[11][12] 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 chose the name "doo-dah" for the tagalong.[13]

Soon after, Matthias Merzenich discovered that a component from the side of 186P7H2V0 can attach to a weekender.[14] On March 19, 2021, Merzenich discovered a width-22 symmetric tagalong for a single weekender[15] and proved that this is the only such period-7 symmetric tagalong at that width.[16]

In 2024, Caleb R. Hilton found a scholar with the traffic light in front removed can act as a tagalong for a pair of scholars or weekenders.[17]


x = 22, y = 76, rule = B3/S23 4bo12bo$4bo12bo$3bobo10bobo$4bo12bo$4bo12bo$5bo3b4o3bo$9b4o$5b4o4b4o2$ 7bo6bo$8b2o2b2o2$4bo12bo$3bob2o8b2obo$2b2ob2o8b2ob2o$2b2ob2o8b2ob2o$5b 3o6b3o$5b2o8b2o$5b2o8b2o2$6bo8bo$6b3o4b3o$5bo4b2o4bo$6b2o6b2o2$6b2o6b 2o$8b6o$4b2o2b6o2b2o$3bo2b2o6b2o2bo$4b2o10b2o$2bo2bo10bo2bo$b3ob2o2bo 2bo2b2ob3o$bobobo3bo2bo3bobobo$4b3o2bo2bo2b3o$2b3o4bo2bo4b3o$2bo6b4o6b o$4b14o$4bo2b2o4b2o2bo3$2b3obo8bob3o$3b2o2bo6bo2b2o$8bo4bo$8b2o2b2o2$ 7bo6bo$6b2o6b2o$5bo10bo$9b4o2$10b2o$8bo4bo$6b2o6b2o$4bobo8bobo$3bob3ob o2bob3obo$2b2o14b2o$2b2obo10bob2o$3b3o10b3o$4bobobo4bobobo$5b2o2bo2bo 2b2o2$3b2obo8bob2o$5b3o6b3o3$4bo12bo$2b2ob2o8b2ob2o$2bo2b2o8b2o2bo$bo 3bo10bo3bo$o5bo8bo5bo$o5bo8bo5bo$bo18bo$2bo3bo8bo3bo$3bobo10bobo$4b2o 10b2o$3b2obo8bob2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 750 WIDTH 500 ZOOM 8 ]]
Weekender tagalong by Matthias Merzenich
(click above to open LifeViewer)
Catagolue: here
x = 44, y = 86, rule = B3/S23 29bo12bo$28b3o10b3o$28b3o10b3o$b3o10b3o$o3bo8bo3bo$31bo3b2o3bo$4bo8bo 15bob4o2b4obo$o7b2o7bo11bob4o2b4obo$2b3o2bo2bo2b3o$3b2ob2o2b2ob2o3b3o 5b3o4b6o$32b2o4b2o$32b2o4b2o$5b8o5b3o5b3o$6bob2obo7bo7bo$18bo9bo$16bo 3b2o3b2o3bo$16b2ob3o3b3ob2o$15bobo11bobo$17b2ob2o3b2ob2o$20bo5bo$17b2o 9b2o$18b3o5b3o$17bo11bo$21bo3bo$13b2obo5bobo5bob2o$12bo2b4o3b3o3b4o2b o$12bo4bo2bob3obo2bo4bo$13b5obo7bob5o$15b3ob2o5b2ob3o$17b2obobobobob2o 2$17b2o3bobo3b2o$17b2o3bobo3b2o$16b2ob3o3b3ob2o$16b2o3bo3bo3b2o$16b2o 11b2o$16b2o2bo5bo2b2o$14bobob2o7b2obobo$19b2o5b2o$16bo3bo5bo3bo$14b2o b3ob2ob2ob3ob2o$15bo6bobo6bo$22bobo$22bobo$16b6o3b6o$14bo2bobo7bobo2b o$13b3o3b3o3b3o3b3o$14bo17bo$18bobo5bobo$17b2obobobobob2o$17b2obobobo bob2o$18bo2bo3bo2bo$17b2o2bo3bo2b2o$16bo4bo3bo4bo$21bo3bo$21bo3bo$20b o5bo$16bob2o7b2obo$17b4o5b4o$20bo5bo$21bo3bo$20b2o3b2o$17b2o9b2o$22bo bo$22bobo$19bo2bobo2bo2$15b2o2b2o5b2o2b2o$14bo2b2o2b5o2b2o2bo$15bo3bo 2b3o2bo3bo$15b2o2bo3bo3bo2b2o$15b2o2bo7bo2b2o$15bo2b2o7b2o2bo$16bo13b o$14bob2o11b2obo$23bo$23bo$16b3o3bobo3b3o$23bo$18b2o3bo3b2o$18b2o7b2o $18bobo5bobo$17bo11bo$16b4o7b4o$15bo15bo$15b2ob2o7b2ob2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 750 WIDTH 500 ZOOM 8 ]]
Scholar as weekender tagalong
(click above to open LifeViewer)
Catagolue: here


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. ↑ 33-glider recipe
  5. ↑ shinjuku (#5443374497) (November 2, 2023). Job triggered by Adam P. Goucher at GitLab Catagolue project.
  6. ↑ iNoMed (February 9, 2024). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  7. ↑ shinjuku (#6136674566) (February 9, 2024). Job triggered by Adam P. Goucher at GitLab Catagolue project.
  8. ↑ KtT (February 9, 2024). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  9. ↑ shinjuku (#6139137922) (February 9, 2024). Job triggered by Adam P. Goucher at GitLab Catagolue project.
  10. ↑ Entity Valkyrie 2 (March 5, 2026). Re: Thread For Synthesisable Spaceship Guns (discussion thread) at the ConwayLife.com forums
  11. ↑ Jiahao Yu (December 6, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  12. ↑ praosylen (December 6, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  13. ↑ John Winston Garth (December 6, 2020). Message in #cgol on the Conwaylife Lounge Discord server
  14. ↑ Matthias Merzenich (December 8, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  15. ↑ Matthias Merzenich (March 19, 2021). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  16. ↑ Matthias Merzenich (March 21, 2021). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  17. ↑ Caleb R. Hilton (February 28, 2024). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
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