p47 pre-pulsar shuttle
| p47 pre-pulsar shuttle | |||||||||||
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| Pattern type | Oscillator | ||||||||||
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| Oscillator type | Shuttle | ||||||||||
| Number of cells | 84 | ||||||||||
| Bounding box | 31×30 | ||||||||||
| Period | 47 | ||||||||||
| Mod | 47 | ||||||||||
| Heat | 60.9 | ||||||||||
| Volatility | 0.89 | ||||||||||
| Strict volatility | 0.89 | ||||||||||
| Discovered by | David Buckingham | ||||||||||
| Year of discovery | 1982 | ||||||||||
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p47 pre-pulsar shuttle is a period-47 shuttle oscillator discovered by David Buckingham on December 5, 1982[1] and was the first oscillator of that period to be discovered. It consists of four tubs, four blinkers, four eater 1s and two blocks hassling two pre-pulsars. Hassling pre-pulsars in manners similar to this was the only known method of constructing period-47 oscillators until discovery of the Snark in 2013. In terms of its 84 cells, it is the smallest known period-47 oscillator.
On May 12, 2003 Jason Summers found that sparks from four copies of this oscillator could be used to support a period-47 t-tetromino engine,[2] and in February 2009 Nicolay Beluchenko noticed that this only required two copies of the oscillator,[3] as shown below.
A 64-glider synthesis was discovered in October 2013 by Martin Grant.[4] The synthesis was reduced to 39 gliders by Matthias Merzenich in December 2019.[5]
Image gallery
 Generation 4 reveals that the objects being hassled are pre-pulsars |
 An extended version of this oscillator, found by Jason Summers and improved by Nicolay Beluchenko Download RLE: click here |
See also
- Pre-pulsar shuttle
- Eureka
- Newshuttle
- p26 pre-pulsar shuttle
- p28 pre-pulsar shuttle
- p29 pre-pulsar shuttle
- p58 pre-pulsar shuttle
- p55 pre-pulsar hassler
References
- ↑ Dean Hickerson's oscillator stamp collection. Retrieved on June 18, 2009.
- ↑ Jason Summers' jslife pattern collection. Retrieved on March 14, 2020.
- ↑ "New Oscillators". H. Koenig (March 16, 2009). Retrieved on March 28, 2009.
- ↑ Martin Grant (October 6, 2013). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
- ↑ Matthias Merzenich (December 11, 2019). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
External links
- 84P47.1 at Heinrich Koenig's Game of Life Object Catalogs
- Patterns
- Oscillators with 84 cells
- Patterns with 84 cells
- Patterns found by David Buckingham
- Patterns found in 1982
- Patterns that can be constructed with 39 gliders
- Outer-totalistically endemic patterns
- Oscillators
- Periodic objects with minimum population 84
- Shuttles
- Oscillators with period 47
- Oscillators with mod 47
- Oscillators with heat 60
- Oscillators with volatility 0.89
- Oscillators with strict volatility 0.89
- Patterns with rectangular orthogonal symmetry
- Pre-pulsar shuttle oscillators
