p18 bi-block hassler

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p18 bi-block hassler
x = 15, y = 20, rule = B3/S23 4bo$4obo$3obobo$5bobo$6bo$5b2o$5b2o3bo$5b2o2bobob2o$13b2o3$7bo2bo$7bo$ 6bo4bo$5bobo2b2o$3b2obo3$3bo2bo$5b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ HEIGHT 600 THUMBSIZE 3 ZOOM 21 GPS 6 LOOP 18 ]]
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Pattern type Oscillator
Number of cells 43
Bounding box 21 × 15
Period 18 (mod: 18)
Heat 27.4
Volatility 0.85 | 0.23
Kinetic symmetry n
Discovered by Noam Elkies
Year of discovery 1995

p18 bi-block hassler (or 43P18) is a period-18 oscillator discovered by Noam Elkies on February 20, 1995.[1] In terms of its 43 cells, it is the smallest known period 18 oscillator, tied with caterer phase-shifing p5.[2][3] The unix on the bottom can be positioned in 2 places.

It is composed of two copies of unix that are hassling a bi-block, as shown below.

A 13-glider synthesis of the oscillator was found in August 2021.[4] A 12-glider synthesis was found in March 2023.[5][6]

Generation 14 reveals that the oscillator is made up of two copies of unix and a bi-block.

See also

References

  1. ↑ Dean Hickerson's oscillator stamp collection. Retrieved on June 16, 2009.
  2. ↑ "Class 2 Objects Catalog". Retrieved on April 11, 2009.
  3. ↑ Jason Summers' all-osc pattern collection. Retrieved on April 12, 2009.
  4. ↑ mattiward (August 29, 2021). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  5. ↑ shinjuku (#4015626809) (March 28, 2023). Job triggered by Adam P. Goucher at GitLab Catagolue project.
  6. ↑ Carson Cheng (March 25, 2023). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums



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