Pseudo-barberpole

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Pseudo-barberpole
x = 12, y = 12, rule = B3/S23 10b2o$11bo$9bo$7bobo2$5bobo2$3bobo2$2b2o$o$2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 2 ZOOM 20 LOOP 5 ]]
Pattern type Oscillator
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

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]

Commonness

As of February 2022, this is one of four 15-cell oscillators, and one of eight 15-cell periodic objects (still lifes, oscillators and spaceships) which are yet to arise naturally from an asymmetric soup on Catagolue, with the other three oscillators being the nonapole, phoenix with cavity and tripole tie snake.[6]

Glider synthesis

Goldtiger997 found a 16-glider synthesis based on a sample soup from Adam P. Goucher's Catagolue on April 22, 2017.[7] Martin Grant found an unrelated 13-glider synthesis that can also act as a component on June 20, 2018.[8]

Gallery

x = 13, y = 13, rule = b3/s23 10b2ob$2o9bob$o8bo3b$2b2o3bobo3b2$3bobobo5b2$5bobobo3b2$3bobo3b2o2b$3b o8bo$bo9b2o$b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ]]
A radially symmetric relative of the pseudo-barberpole
(click above to open LifeViewer)
RLE: here Plaintext: here

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. https://conwaylife.com/forums/viewtopic.php?t=5549
  7. Goldtiger997 (2017-04-22). "Re: Soup search results". ConwayLife.com forums. Retrieved on 2017-04-23.
  8. "Synthesising Oscillators". Retrieved on October 24, 2018.

External links

  • 15P5.1 at Heinrich Koenig's Game of Life Object Catalogs