28P7.1
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28P7.1 | |||||||||||
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Pattern type | Oscillator | ||||||||||
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Number of cells | 28 | ||||||||||
Bounding box | 13 × 9 | ||||||||||
Period | 7 (mod: 7) | ||||||||||
Heat | 4.9 | ||||||||||
Volatility | 0.40 | 0.40 | ||||||||||
Kinetic symmetry | n | ||||||||||
Discovered by | Dean Hickerson | ||||||||||
Year of discovery | 1998 | ||||||||||
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28P7.1 is an unnamed period-7 oscillator discovered by Dean Hickerson on November 1, 1998.[1] In terms of its 28 cells, it is tied with oscillators burloaferimeter, 28P7.2, and 28P7.3 as the smallest known period 7 oscillator.[2]
Using a sufficiently accessible dot spark, this oscillator can be phase shifted one generation backwards. The period of the resulting oscillator is the smallest number of the form 7n + 1 which is also a multiple of the spark period.
Top: p8 using mold, p15 using pentadecathlon. Bottom: p92 using twin bees shuttle, p141 using p47 pre-pulsar shuttle (click above to open LifeViewer) RLE: here Plaintext: here |
A glider synthesis for this oscillator was found by Martin Grant in November 2013.[3]
References
- ↑ Jason Summers' jslife pattern collection. Retrieved on October 28, 2020.
- ↑ "Class 2 Objects Catalog". Retrieved on March 14, 2009.
- ↑ Martin Grant (November 9, 2013). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
External links
- 28P7.1 at Adam P. Goucher's Catagolue
- 28P7.1 at Heinrich Koenig's Game of Life Object Catalogs
Categories:
- Patterns
- Oscillators with 28 cells
- Periodic objects with minimum population 28
- Patterns with 28 cells
- Patterns found by Dean Hickerson
- Patterns found in 1998
- Patterns that can be constructed with 18 gliders
- Oscillators
- Oscillators with period 7
- Oscillators with mod 7
- Oscillators with heat 4
- Oscillators with volatility 0.40
- Oscillators with strict volatility 0.40
- Oscillators with n symmetry
- Unnamed periodic objects