Caterer on 28P7.3
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Caterer on 28P7.3  
View static image  
Pattern type  Oscillator  

Number of cells  40  
Bounding box  13×17  
Period  21  
Mod  21  
Heat  22.7  
Volatility  0.67  
Strict volatility  0.01  
Discovered by  Unknown  
Year of discovery  Unknown  
 
 

Caterer on 28P7.3 is a period 21 oscillator that is composed of a caterer and 28P7.3. Although it is composed of two oscillators of smaller periods (3 and 7 respectively), it is considered nontrivial because it contains a single cell that is alive in generation 5 and dead in the other 20 phases of the oscillator. In terms of its 40 cells, it is the smallest known nontrivial period 21 oscillator, although the trivial burloaferimeter and long hook eating tub has a minimum population of only 36 cells.