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|Number of cells||122|
|Discovered by|| Luka Okanishi|
Aidan F. Pierce
|Year of discovery||2019|
David Hilbert[note 1] (or 122P23) was the first period-23 oscillator to be discovered. It was found by Luka Okanishi on November 24, 2019 based on a partial result by Aidan F. Pierce. It consists of two copies of an engine, itself consisting of a B-heptomino being hassled by two unusual catalysts and a block, supported by a known period-agnostic beehive shuttle mechanism (seen in, for example, an extension of the carnival shuttle). There are several isomers known (including trans- versions and different phase offsets), with the one pictured having minimum population and bounding box. A 101-glider synthesis for one of these variants was posted by Goldtiger997 on December 29.
- Luka Okanishi (November 25, 2019). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
- Luka Okanishi (November 24, 2019). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
- Adam P. Goucher. "xp23_y2c9b8ozy031130gy0ggy2o8b9czxggw65532w11ggy339e0o8goz62470s4gy433xahh3x23zy2d5k46y233w59ddiwgzy311y964k5d11zyk11". Catagolue. Retrieved on December 29, 2019.
- Goldtiger997 (December 29, 2019). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums