Weekender

Weekender is a 2c/7 orthogonal spaceship that was found by David Eppstein on January 12, 2000.[1] On April 27, 2000, Stephen Silver found a tagalong for a pair of weekenders (shown below). 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.

Weekender
<html><div class="rle"><div class="codebox"><div style="display:none;"><code></html> #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 ]] <nowiki>#C [[ GPS 7 TRACKLOOP 7 0 -2/7 THUMBSIZE 2 ]]</nowiki> <html></code></div></div><canvas width="200" height="300" style="margin-left:1px;"><noscript></html> <html></noscript></canvas></div></html>
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Pattern type Spaceship
Number of cells 36
Bounding box 18×12
Direction Orthogonal
Period 7
Mod 7
Speed 2c/7
Speed (unsimplified) 2c/7
Heat 45.1
Discovered by David Eppstein
Year of discovery 2000

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]

Two weekenders followed by a tagalong
RLE: here
gollark: WebM (VP9/Opus).
gollark: This is very slow. I should probably have used hardware encoding. Oh well.
gollark: Yes, I'm aware, that's why I'm reencoding it.
gollark: Why would the ZIPening help me upload it?
gollark: You want the video in a ZIP? Why?

See also

References
  1. Jason Summers' jslife pattern collection.
  2. Martin Grant (January 25, 2015). "Re: Small Spaceship Syntheses". Retrieved on January 25, 2015.
  3. Chris Cain (September 26, 2015). "Re: Small Spaceship Syntheses". Retrieved on October 7, 2015.
  • 36P7H2V0.1 at Heinrich Koenig's Game of Life Object Catalogs
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