Gabriel's p138

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Gabriel's p138
x = 21, y = 21, rule = b3/s23 8b3o10b$7bo2bo10b$7bo2bo10b$7b2o12b4$17b3ob$17bo2bo$20bo$3o15b3o$o20b$ o2bo17b$b3o17b4$12b2o7b$10bo2bo7b$10bo2bo7b$10b3o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ LOOP 138 GPS 23 THUMBSIZE 3 ZOOM 16 WIDTH 640 HEIGHT 640 ]]
Pattern type Oscillator
Number of cells 36
Bounding box 33×33
Period 138
Mod 69
Heat 57.7
Volatility 1.00
Strict volatility 0.87
Discovered by Gabriel Nivasch
Year of discovery 2002

Gabriel's p138 is a period-138 oscillator discovered by Gabriel Nivasch on October 13, 2002. In terms of its 36 cells, it is, by far, the smallest known period 138 oscillator.[1] Within a month of its discovery, Jason Summers found a 12-glider synthesis for this oscillator.[2]

A variant of Gabriel's p138 with blocks.
View animated image.

The first known semi-natural appearance of this oscillator was in November 2014 in a soup found by Dongook Lee using apgsearch.[3]

See also


  1. Jason Summers' all-osc pattern collection.
  2. Jason Summers' jslife pattern collection.
  3. Dongook Lee (December 1, 2014). Re: Soup search results (discussion thread) at the forums

External links

  • 36P136.1 at Heinrich Koenig's Game of Life Object Catalogs (note: site incorrectly lists period as 136 instead of 138)