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x = 14, y = 18, rule = B3/S23 2o12b$bo12b$bobo10b$2b2o10b$8bo5b$7b2o5b$8bo5b5$5bo8b$5b2o7b$5bo8b$10b 2o2b$10bobob$12bob$12b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 4 LOOP 36 THUMBSIZE 2 ZOOM 12 ]]
Pattern type Oscillator
Number of cells 22
Bounding box 14 × 18
Period 36
Mod 36
Heat 19.2
Volatility 0.89
Strict volatility 0.89
Discovered by Noam Elkies
Year of discovery 1995
This article is about the 22-cell period-36 oscillator. For the 36-cell period-22 oscillator (36P22), see Jason's p22.

22P36 is an unnamed period-36 oscillator found by Noam Elkies on January 29, 1995.[1] It consists of two traffic lights (or two phi sparks in some phases) being hassled by two eater 1s. In terms of population it is currently the smallest period 36 oscillator, and in fact, the smallest oscillator with period 36 or above.

It first appeared semi-naturally in July or August 2017, in a symmetric soup submitted to Catagolue by Moth Wingthane.[2] Since then, about 1 in 5 billion soups with the correct rotational symmetry form a 22P36, including those where an integral or other similar object replaces each fishhook.

On December 15, 2021, based on cvojan's observation that a single traffic light can be similarly hassled at other periods, 83bismuth38 constructed a monomer of this oscillator with 104P9.[3]

x = 21, y = 22, rule = B3/S23 18bo$17bobo$16bo3bo$15bo3bo$2o12bo3bo$bo11bo3bo$bobo10bobo$2b2o11bo$8b o$7b2o$8bo5$5bo$5b2o$5bo$10b2o$10bobo$12bo$12b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 24 THUMBSIZE 2 ZOOM 12 ]]
Figure eight on 22P36, the smallest known p72 oscillator by population
(click above to open LifeViewer)
RLE: here Plaintext: here

On August 24, 2023, Carson Cheng reduced the synthesis cost from 9 gliders to 8 gliders.[4]

See also


  1. Dean Hickerson's oscillator stamp collection. Retrieved on June 16, 2009.
  2. Apple Bottom (August 1, 2017). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  3. 83bismuth38 (December 15, 2021). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
  4. Carson Cheng (August 24, 2023). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums

External links