Karel's p177

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Karel's p177
x = 46, y = 46, rule = B3/S23 16bo12bo$9b2o24b2o$8b3o3b2o14b2o3b3o$14b2ob2o8b2ob2o$16bo12bo4$2bo40bo $b2o40b2o$b2o40b2o4$2b2o38b2o$2b2o38b2o$o3bo36bo3bo$3bo38bo$3bo38bo9$ 3bo38bo$3bo38bo$o3bo36bo3bo$2b2o38b2o$2b2o38b2o4$b2o40b2o$b2o40b2o$2bo 40bo4$16bo12bo$14b2ob2o8b2ob2o$8b3o3b2o14b2o3b3o$9b2o24b2o$16bo12bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 59 LOOP 177 THUMBSIZE 2 HEIGHT 480 WIDTH 480 ]]
Pattern type Oscillator
Number of cells 104
Bounding box 62×62
Period 177
Mod 177
Heat 215.3
Volatility 1.00
Strict volatility 1.00
Discovered by Karel Suhajda
Year of discovery 2007

Karel's p177 (or 104P177) is a period-177 oscillator discovered by Karel Suhajda in June 2007.[1] In terms of its minimum population of 104 cells, it is the smallest known period 177 oscillator. It can serve as a 90° or 180° degree reflector in many ways, and with the correct phasing, a glider can pass through it unharmed. On March 21, 2009 Jason Summers found a 24-glider synthesis of this oscillator.[2]

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

Image gallery

Several reactions involving Karel's p177
Download RLE: click here

See also


  1. Jason Summers' all-osc pattern collection.
  2. Jason Summers' jslife pattern collection. Retrieved on January 5, 2020.
  3. Dongook Lee (December 19, 2014). Re: Soup search results (discussion thread) at the ConwayLife.com forums

External links

  • 104P177.1 at Heinrich Koenig's Game of Life Object Catalogs