47P72 (or two blockers hassling R-pentomino) is a period 72 oscillator. It was the first period 72 oscillator to be found, 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.
|Still life-supported oscillator by Tanner Jacobi (click above to open LifeViewer)|
- ↑ Mark D. Niemiec. "Life Oscillators and Pseudo-Oscillators". Retrieved on December 9, 2018.
- ↑ Dean Hickerson's DRH-oscillators.rle oscillator collection, retrieved on May 15, 2009
- ↑ Tanner Jacobi. "Re: The Hunting of the New Herschel Conduits". Retrieved on December 9, 2018.