p47 pre-pulsar shuttle

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p47 pre-pulsar shuttle
x = 30, y = 31, rule = B3/S23 2bo24bo$2b3o20b3o$5bo18bo$4b2o18b2o3$6b3o12b3o$14b2o$14b2o2$bo9bo6bo9b o$obo7bo8bo7bobo$bo8bo8bo8bo$10bo8bo$11bo6bo2$11bo6bo$10bo8bo$bo8bo8bo 8bo$obo7bo8bo7bobo$bo9bo6bo9bo2$14b2o$14b2o$6b3o12b3o3$4b2o18b2o$5bo 18bo$2b3o20b3o$2bo24bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 8 ZOOM 9 LOOP 47 ]]
Pattern type Oscillator
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

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.

In May 2003 Jason Summers found that sparks from four copies of this oscillator could be used to support a period-47 t-tetromino engine, and in February 2009 Nicolay Beluchenko noticed that this only required two copies of the oscillator,[2] as shown below.

A 64-glider synthesis was discovered in October 2013 by Martin Grant.[3] The synthesis was reduced to 39 gliders by Matthias Merzenich in December 2019.[4]

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

References

  1. Dean Hickerson's oscillator stamp collection. Retrieved on June 18, 2009.
  2. "New Oscillators". H. Koenig (March 16, 2009). Retrieved on March 28, 2009.
  3. Martin Grant (October 6, 2013). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  4. 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