22P36
| 22P36 | |||||||||
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| Pattern type | Oscillator | ||||||||
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| Number of cells | 22 | ||||||||
| Bounding box | 14 × 18 | ||||||||
| Period | 36 | ||||||||
| Mod | 36 | ||||||||
| Heat | 19.2 | ||||||||
| Volatility | 0.89 | ||||||||
| Strict volatility | 0.89 | ||||||||
| Discovered by | Noam Elkies | ||||||||
| Year of discovery | 1995 | ||||||||
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- This article is about the 22-cell period-36 oscillator. For the 36-cell period-22 oscillator (36P22), see Jason's p22.
22P36 is an unnamed period-36 oscillator found by Noam Elkies on January 29, 1995.[1] It consists of two traffic lights (or two phi sparks in some phases) being hassled by two eater 1s. In terms of population it is currently the smallest period 36 oscillator, and in fact, the smallest oscillator with period 36 or above.
It first appeared semi-naturally in July or August 2017, in a symmetric soup submitted to Catagolue by Moth Wingthane.[2] Since then, about 1 in 5 billion soups with the correct rotational symmetry form a 22P36, including those where an integral or other similar object replaces each fishhook.
On December 15, 2021, based on cvojan's observation that a single traffic light can be similarly hassled at other periods, 83bismuth38 constructed a monomer of this oscillator with 104P9.[3]
| Figure eight on 22P36, the smallest known p72 oscillator by population (click above to open LifeViewer) RLE: here Plaintext: here Catagolue: here |
On August 24, 2023, Carson Cheng reduced the synthesis cost from 9 gliders to 8 gliders.[4]
See also
References
- ↑ Dean Hickerson's oscillator stamp collection. Retrieved on June 16, 2009.
- ↑ Apple Bottom (August 1, 2017). Re: Soup search results (discussion thread) at the ConwayLife.com forums
- ↑ 83bismuth38 (December 15, 2021). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ Carson Cheng (August 24, 2023). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
External links
- Patterns
- Oscillators with 22 cells
- Periodic objects with minimum population 22
- Patterns with 22 cells
- Patterns found by Noam Elkies
- Patterns found in 1995
- Patterns that can be constructed with 8 gliders
- Oscillators
- Oscillators with period 36
- Oscillators with mod 36
- Oscillators with heat 19
- Oscillators with volatility 0.89
- Oscillators with strict volatility 0.89
- Patterns with 180-degree rotation symmetry
- Unnamed periodic objects
- Semi-natural periodic objects