Pseudo-barberpole

The pseudo-barberpole (or Achim's p5[1]) is a period-5 oscillator that was found by Achim Flammenkamp on August 22, 1994.[2] With a minimum population of 15 cells, it is the smallest known period 5 oscillator, followed by octagon 2 with 16 cells.[3][4] On October 23, 2002 Gabriel Nivasch found a period 5 oscillator that consists of four radially symmetrically arranged halves of the pseudo-barberpole.[5]

Pseudo-barberpole
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Pattern type Oscillator
Oscillator type Muttering moat
Family Barberpole
Number of cells 15
Bounding box 12×12
Period 5
Mod 5
Heat 16.8
Volatility 0.82
Strict volatility 0.82
Discovered by Achim Flammenkamp
Year of discovery 1994

Synthesis

Goldtiger997 found a 16-glider synthesis based on a sample soup from Adam P. Goucher's Catagolue on April 22, 2017.[6] Martin Grant found an unrelated 13-glider synthesis that can also act as a component on June 20, 2018.[7]

A radially symmetric relative of the pseudo-barberpole
RLE: here
gollark: Wrong.
gollark: THERE DID NOT NEED TO BE MULTIPLE OPTIONS HERE
gollark: WHY
gollark: Yes, this is documented.
gollark: Macron idea: `let` initiates a runtime compile error.

See also

References
  1. "Achim's p5". The Life Lexicon. Stephen Silver. Retrieved on December 3, 2018.
  2. Dean Hickerson's oscillator stamp collection.
  3. Mark Niemiec (1998). "Life Period-5 Oscillators". Retrieved on February 15, 2009.
  4. "Class 2 Objects Catalog". Retrieved on March 14, 2009.
  5. Jason Summers' all-osc pattern collection.
  6. Goldtiger997 (2017-04-22). "Re: Soup search results". ConwayLife.com forums. Retrieved on 2017-04-23.
  7. "Synthesising Oscillators". Retrieved on October 24, 2018.
  • 15P5.1 at Heinrich Koenig's Game of Life Object Catalogs
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