- This article is about the 36-cell period-22 oscillator. For the 22-cell period-36 oscillator, see 22P36.
Jason's p22 (or 36P22) is a period-22 oscillator discovered by Jason Summers on August 27, 2000. It is composed of an unnamed reaction stabilized by two copies of eater 1. In terms of its 36 cells, it is the smallest known non-trivial period-22 oscillator, followed by p22 honey farm hassler and champagne glass with 40 and 45 cells, respectively.
It gives off sparks, which in addition to allowing for the construction of non-trivial higher-period oscillators as seen in a later section, can be used to hassle various patterns shown in gallery below. Later on the day of the oscillator's discovery, David Eppstein found a way to combine two of them to produce the first true period-22 glider gun.
In February 2001, Jason Summers found a 12-glider synthesis of this oscillator, which was improved to 11 gliders by 2718281828 in December 2017 and later 10 by Mark Niemiec in September 2019.
The oscillators below are listed due to being the smallest known ones by population, while also satisfying the condition that at least one cell oscillates at the full period.
- 30P25, another rotationally symmetric oscillator consisting of an active region supported by two fishhooks
- 36P22.1 at Heinrich Koenig's Game of Life Object Catalogs