Two blockers hassling R-pentomino

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47P72 image
Pattern type Oscillator
Number of cells 47
Bounding box 30×19
Period 72
Mod 36
Heat 34.1
Volatility 0.97
Strict volatility 0.70
Discovered by Robert Wainwright
Year of discovery 1990

47P72 (or two blockers hassling R-pentomino[1]) is a period 72 oscillator. It was the first period 72 oscillator to be found,[2] and was discovered by Robert Wainwright in July 1990.

It is made up of two blockers that are hassling two blocks and an R-pentomino. It makes appearances in many large guns such as the gunstars and new gun 2. On January 12, 2016 Tanner Jacobi found a way to replace the blockers with still lifes.[3]

x = 26, y = 20, rule = B3/S23 o24bo$3o20b3o$3bo18bo$2b2o18b2o3$19bo$19b2o$9b2o9bo$8b2o9bo$8bo8bobo$ 9bo7bobo$5b2o11bo$5b2o3$7b2o8b2o$3b2obobo8bobob2o$3bob2obobo4bobob2obo $9b2o4b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBNAIL THUMBSIZE 2 HEIGHT 360 THEME 6 GPS 36 LOOP 72 ZOOM 10 AUTOSTART ]]
Still life-supported oscillator by Tanner Jacobi (click above to open LifeViewer)
RLE: here Plaintext: here


  1. Mark D. Niemiec. "Life Oscillators and Pseudo-Oscillators". Retrieved on December 9, 2018.
  2. Dean Hickerson's DRH-oscillators.rle oscillator collection, retrieved on May 15, 2009
  3. Tanner Jacobi. "Re: The Hunting of the New Herschel Conduits". Retrieved on December 9, 2018.

External links