p40 B-heptomino shuttle
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p40 B-heptomino shuttle | |||||||||||
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Pattern type | Oscillator | ||||||||||
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Oscillator type | Shuttle | ||||||||||
Number of cells | 68 | ||||||||||
Bounding box | 28 × 23 | ||||||||||
Period | 40 (mod: 20) | ||||||||||
Heat | 44.2 | ||||||||||
Volatility | 0.88 | 0.45 | ||||||||||
Kinetic symmetry | n-e | ||||||||||
Discovered by | David Buckingham | ||||||||||
Year of discovery | Unknown | ||||||||||
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P40 B-heptomino shuttle is a period-40 shuttle oscillator found by David Buckingham sometime before May 1991,[1] being the first period 40 oscillator to be discovered.[note 1] It consists of two blockers, two tubs, and a fumarole hassling a B-heptomino.
Martin Grant found a 29-glider synthesis in October 2013.[2] On October 21, 2024, Chris857 lowered the cost to 25 gliders.[3][4]
Image gallery
See also
Notes
- ↑ A nontrivial period-40 oscillator, such as octagon II on figure eight, could have been constructed from two oscillators of lower period (such as p5 and p8), both of which were known by an earlier date. However, no such LCM oscillators were attested prior to the discovery of this oscillator on or before 1991.
References
- ↑ Dean Hickerson's oscillator stamp collection.
- ↑ Martin Grant (October 11, 2013). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
- ↑ Chris857 (October 17, 2024). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
- ↑ shinjuku (#8138669964) (June 11, 2023). Job triggered by Adam P. Goucher at GitLab Catagolue project.
External links
- 68P40.1 at Heinrich Koenig's Game of Life Object Catalogs
Categories:
- Patterns
- Oscillators with 68 cells
- Periodic objects with minimum population 68
- Patterns with 68 cells
- Patterns found by David Buckingham
- Patterns that can be constructed with 25 gliders
- Oscillators
- Shuttles
- Oscillators with period 40
- Oscillators with mod 20
- Oscillators with heat 44
- Oscillators with volatility 0.88
- Oscillators with strict volatility 0.45
- Oscillators with n-e symmetry