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3b2ob$2bo2bo$o2bobo$o3bob$o5b$3bo2b$b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ THUMBSIZE 2 GPS 2 ]]
Pattern type Oscillator
Number of cells 13
Bounding box 7×7
Frequency class 27.6
Period 3
Mod 3
Heat 7.3
Volatility 0.55
Strict volatility 0.55
Discovered by Achim Flammenkamp
Year of discovery 1988

Jam was found by Achim Flammenkamp in 1988,[1] but not widely known about until its independent discovery (and naming) by Dean Hickerson in September 1989. In terms of its 7×7 bounding box it ties with trice tongs as the smallest period-3 oscillator, though caterer has fewer cells.


Jam is about the seventeenth most common naturally-occurring oscillator in Achim Flammenkamp's census, being slightly less common than the blocker.[2] On Catagolue, it is the second most common period 3 oscillator, being less common than the pulsar but more common than the candlefrobra on trans-block.[3]

Glider synthesis

All strict still lifes with a population of 20 or fewer cells, as well as all oscillators and spaceships with 16 or fewer cells, are known to be glider-constructible. A glider synthesis of this object can be found in the infobox to the right.

See also


  1. Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
  2. Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
  3. Adam P. Goucher. "Census". Catagolue. Retrieved on October 27, 2018.

External links

  • 13P3.1 at Heinrich Koenig's Game of Life Object Catalogs