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47P72 image
Pattern type Oscillator
Number of cells 47
Bounding box 30×19
Period 72
Mod Unknown
Heat 34.1
Volatility 0.97
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.


  1. Mark D. Niemiec. "Life Oscillators and Pseudo-Oscillators". Retrieved on July 5, 2009.
  2. Dean Hickerson's DRH-oscillators.rle oscillator collection, retrieved on May 15, 2009

External links