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43P18 image
Pattern type Oscillator
Number of cells 43
Bounding box 21×15
Period 18
Mod Unknown
Heat 27.4
Volatility 0.85
Strict volatility 0.23
Discovered by Noam Elkies
Year of discovery 1995

43P18 (or P18 bi-block hassler) 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]

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