Elkies' p5

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Elkies' p5
x = 9, y = 8, rule = B3/S23 bo$o2b3o$2bo$3bobo2bo$2b2ob4o$4bo$4bobo$5b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ LOOP 5 GPS 2 THUMBSIZE 2 ]]
Pattern type Oscillator
Number of cells 20
Bounding box 9×8
Frequency class 43.0
Period 5
Mod 5
Heat 6.8
Volatility 0.55
Strict volatility 0.55
Discovered by Noam Elkies
Year of discovery 1997

Elkies' p5 is a period-5 oscillator that was found by Noam Elkies in 1997.

Elkies' p5 first occurred naturally in a soup found by Adam P. Goucher's apgsearch program in April 2015. Other efforts from apgsearch allowed a 15-glider synthesis of an 18-cell still life which can be converted to Elkies' p5. This 20-glider synthesis was completed by Brett Berger and Martin Grant. This was further improved to 8 gliders by Brett Berger and Martin Grant following a second natural occurrence in January 2016.


On Catagolue, it is the third most common period 5 oscillator, after octagon II and fumarole.[1]

See also


  1. Adam P. Goucher. "Statistics". Catagolue. Retrieved on October 27, 2018.

External links

  • 20P5.11 at Heinrich Koenig's Game of Life Object Catalogs