145P20
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145P20  
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Pattern type  Oscillator  

Number of cells  145  
Bounding box  28×21  
Period  20  
Mod  20  
Heat  72.8  
Volatility  0.60  
Strict volatility  0.18  
Discovered by  Noam Elkies  
Year of discovery  1995  
 
 

145P20 is an unnamed period20 oscillator. It was the first nontrivial period 20 oscillator to be found,^{[note 1]} and was discovered by Noam Elkies on March 22, 1995.^{[1]}
It works by using sparks from three period 4 middleweight emulators and the period 5 middleweight volcano to hassle a traffic light predecessor. The middleweight emulator on the left can be replaced with a middleweight volcano.
Notes
 ↑ A period20 oscillator, heavyweight emulator on octagon II, can be constructed from two sparkers (heavyweight emulator and octagon II) both of which were known by 1980. However, this type of oscillator is generally considered "boring", and thus not counted despite technically being nontrivial.
References
External links
Categories:
 Patterns
 Oscillators with 145 cells
 Patterns with 145 cells
 Patterns found by Noam Elkies
 Patterns found in 1995
 Outertotalistically endemic patterns
 Oscillators
 Periodic objects with minimum population 145
 Oscillators with period 20
 Oscillators with mod 20
 Oscillators with heat 72
 Oscillators with volatility 0.60
 Oscillators with strict volatility 0.18
 Unnamed periodic objects