p18 biblock hassler
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p18 biblock hassler  
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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  
Strict volatility  0.23  
Discovered by  Noam Elkies  
Year of discovery  1995  
 
 
 

P18 biblock 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 biblock, as shown below.
Image gallery
References
 ↑ Dean Hickerson's oscillator stamp collection. Retrieved on June 16, 2009.
 ↑ "Class 2 Objects Catalog". Retrieved on April 11, 2009.
 ↑ Jason Summers' allosc oscillators collection
External links
 p18 biblock hassler at Adam P. Goucher's Catagolue
 43P18.1 at Heinrich Koenig's Game of Life Object Catalogs
Categories:
 Patterns
 Oscillators with 43 cells
 Patterns with 43 cells
 Patterns found by Noam Elkies
 Patterns found in 1995
 Patterns that can be constructed with 14 gliders
 Oscillators
 Periodic objects with minimum population 43
 Oscillators with period 18
 Oscillators with mod 18
 Oscillators with heat 27
 Oscillators with volatility 0.85
 Oscillators with strict volatility 0.23
 Sparkers
 Sparkers with period 18
 Weak sparkers