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 ]]
Pattern type Oscillator
Number of cells 43
Bounding box 21×15
Period 18
Mod 18
Heat 27.4
Volatility 0.85
Strict volatility 0.23
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.[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.

Image gallery

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


  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 oscillators collection

External links

  • 43P18.1 at Heinrich Koenig's Game of Life Object Catalogs