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.
Applications
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.
p47 traffic light hassler (click above to open LifeViewer) RLE: here Plaintext: here |
p47 agar
It has been suggested that this page or section be split into p47 agar. (Discuss) |
On August 1, 2022, iNoMed found a complete support for a p47 B-heptomino-hassling agar.[4] The agar was found by Nicolay Beluchenko in February 2009 and known to be connected via phase-shifting beacons.
p47 B-heptomino hassler (click above to open LifeViewer) RLE: here Plaintext: here |
Glider synthesis
A 64-glider synthesis was discovered in October 2013 by Martin Grant.[5] It starts with constructing the pre-pulsars and tubs, which form a two-fold p30 eureka variant on their own, then inserting blocks, blinkers and eaters to finish this p47. The synthesis was reduced to 39 gliders by Matthias Merzenich in December 2019, using a cheaper soup-based synthesis for the two-fold eureka variant.[6]
See also
- Fire-spitting on p47 pre-pulsar shuttle
- Pre-pulsar shuttle
- 66P13, which gives off the same type of corner dot spark
References
- ↑ Dean Hickerson's oscillator stamp collection. Retrieved on June 18, 2009.
- ↑ Jason Summers' jslife pattern collection. Retrieved on March 14, 2020.
- ↑ New Oscillators at Game of Life News. Posted by Heinrich Koenig on March 16, 2009.
- ↑ iNoMed (August 01, 2022). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
- ↑ 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
- p47 pre-pulsar shuttle at Adam P. Goucher's Catagolue
- 84P47.1 at Heinrich Koenig's Game of Life Object Catalogs
- Patterns
- Oscillators with 84 cells
- Periodic objects with minimum population 84
- 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
- Shuttles
- Oscillators with period 47
- Prime-period oscillators
- Oscillators with mod 47
- Oscillators with heat 60
- Oscillators with volatility 0.89
- Oscillators with strict volatility 0.89
- Patterns with rectangular orthogonal symmetry
- Sparkers
- Dot sparkers
- Moderate sparkers
- Pre-pulsar shuttle oscillators