Achim's p4

Achim's p4 (or cloverleaf) is a period-4 oscillator that was found in a less compact form (using two sombreros) by David Buckingham in 1976. The form shown here was found by Achim Flammenkamp in 1988.[1] The rotor is two copies of the rotor of 1-2-3-4, so the oscillator is sometimes called the dual 1-2-3-4.

Achim's p4
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Pattern type Oscillator
Number of cells 40
Bounding box 11×9
Frequency class 29.0
Period 4
Mod 4
Heat 4
Volatility 0.17
Strict volatility 0.17
Discovered by Achim Flammenkamp
Year of discovery 1988
For other uses of "cloverleaf", see Cloverleaf (disambiguation).

Commonness

Achim's p4 is about the twenty-third most common naturally-occurring oscillator in Achim Flammenkamp's census.[2] On Catagolue, it is the third most common period 4 oscillator, being less common than mazing.[3]

Synthesis

An 8-glider synthesis of this oscillator was found by Jason Summers in September 2004.[4] In October 2010, Lewis Patterson found a predecessor of this oscillator that allows a 7-glider synthesis.[5][6] This was improved to 6 gliders by Chris Cain in March 2015.[7]

The original, less compact form of Achim's p4
gollark: Okay, I do actually have the latest version on curseforge, hmm.
gollark: It does? I should update.
gollark: <@237328509234708481> Are you planning to readd that CCTweaks feature allowing turtles to use any tool via a tool manipulator or whatever?
gollark: Can *your* OS do that?
gollark: By multiplying two smallish prime numbers (inaccessible to the user except via the debug API, if it was available in potatOS (it's not, fully)) to make a bigger *semi*prime it's possible to make a problem easy to generate but relatively hard to solve.

See also

References
  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.
  4. Jason Summers' jslife pattern collection. Retrieved on January 5, 2020.
  5. Lewis Patterson (October 17, 2010). Re: Thread For Your Accidental Discoveries (discussion thread) at the ConwayLife.com forums
  6. Matthias Merzenich (October 17, 2010). Re: Thread For Your Accidental Discoveries (discussion thread) at the ConwayLife.com forums
  7. Chris Cain (March 1, 2015). Re: Thread for your unsure discoveries (discussion thread) at the ConwayLife.com forums
  • 40P4.9 at Heinrich Koenig's Game of Life Object Catalogs
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