p129 Rpentomino hassler
p129 Rpentomino hassler  
View static image  
Pattern type  Oscillator  

Number of cells  38  
Bounding box  65 × 29  
Period  129  
Mod  129  
Heat  35.5  
Volatility  0.96  
Strict volatility  0.96  
Discovered by  Luka Okanishi Luke Kiernan  
Year of discovery  2022  
 
 
 

p129 Rpentomino hassler (or 38P129) is a period129 oscillator discovered by Luka Okanishi on August 21, 2022, based on a partial found on the previous day.^{[1]} It is the smallest known period129 oscillator, superseding the 146cell p3 22hd reflector loop.
The only known oscillators with greater period and fewer cells are Gabriel's p138 (36 cells), pentadecathlon on Rob's p16 (p240, 33 cells), and an infinite family of extensions of the p60 glider shuttle of period 60 + 120 N (29 cells).
A 14glider synthesis of this oscillator was found on the day of its discovery.^{[2]}
A new period129 glider gun was found on August 21, 2022^{[3]}^{[4]} and reduced on August 25, 2022^{[5]}; it was the smallest known gun with this period^{[6]} until the discovery of the period43 glider gun.
References
 ↑ Luka Okanishi (August 21, 2022). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
 ↑ Carson Cheng (August 21, 2022). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
 ↑ AbhpzTa (August 21, 2022). Re: Execution of Old Guns by VariableSpeed Firing Squad (discussion thread) at the ConwayLife.com forums
 ↑ calcyman (August 21, 2022). Re: Execution of Old Guns by VariableSpeed Firing Squad (discussion thread) at the ConwayLife.com forums
 ↑ iNoMed (August 25, 2022). Re: Execution of Old Guns by VariableSpeed Firing Squad (discussion thread) at the ConwayLife.com forums
 ↑ A capped form of the older guntrue_129 with 3969cell bounding box is available by this link.
External links
 Patterns
 Oscillators with 38 cells
 Periodic objects with minimum population 38
 Patterns with 38 cells
 Patterns found by Luka Okanishi
 Patterns found by Luke Kiernan
 Patterns found in 2022
 Patterns that can be constructed with 14 gliders
 Outertotalistically endemic patterns
 Oscillators
 Oscillators with period 129
 Oscillators with mod 129
 Oscillators with heat 35
 Oscillators with volatility 0.96
 Oscillators with strict volatility 0.96
 Patterns with 180degree rotation symmetry
 Rpentomino hasslers