124P21
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124P21  
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Pattern type  Oscillator  

Number of cells  124  
Bounding box  36 × 25  
Period  21  
Mod  21  
Heat  55.8  
Volatility  0.64  
Strict volatility  0.30  
Discovered by  Robert Wainwright  
Year of discovery  1995  
 
 

124P21 is an unnamed period21 oscillator that was discovered by Robert Wainwright on February 21, 1995.^{[1]} It was the first period 21 oscillator to be found.^{[note 1]}
It works by using two period 3 caterers and two copies of 44P7.2 to hassle two traffic light predecessors.
Notes
 ↑ A nontrivial period21 oscillator, such as jam on 44P7.2, could have been constructed from two oscillators of lower period (such as p3 and p7), both of which were known by an earlier date. However, no such LCM oscillators were attested prior to the discovery of this oscillator in 1995.
References
 ↑ Dean Hickerson's oscillator stamp collection. Retrieved on April 17, 2009.
External links
Categories:
 Patterns
 Oscillators with between 120 and 129 cells
 Periodic objects with minimum population between 120 and 129
 Patterns with between 120 and 129 cells
 Patterns found by Robert Wainwright
 Patterns found in 1995
 Outertotalistically endemic patterns
 Oscillators
 Oscillators with period 21
 Oscillators with mod 21
 Oscillators with heat 55
 Oscillators with volatility 0.64
 Oscillators with strict volatility 0.30
 Patterns with 180degree rotation symmetry
 Unnamed periodic objects