p29 pre-pulsar shuttle

p29 pre-pulsar shuttle (or prime[1]) is a period-29 shuttle oscillator discovered by David Buckingham on August 2, 1980,[1] making it the first oscillator of that period to be found. In terms of its 54 cells it is the smallest known period-29 oscillator.[2] The oscillator works by combining the 15-generation, two-tub pre-pulsar shuttle mechanism used in Eureka with a 14-generation pre-pulsar shuttle mechanism. Hassling pre-pulsars in this way was the only known way of constructing period 29 oscillators until the discovery of the p29 traffic-farm hassler. In September 1994 Bill Gosper found that two copies of pre-pulsar shuttle 29 could be used to hassle a pentadecathlon. Gosper used this to construct the p58 toadsucker.

p29 pre-pulsar shuttle
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Pattern type Oscillator
Oscillator type Shuttle
Number of cells 54
Bounding box 28×28
Period 29
Mod 29
Heat 41.5
Volatility 0.90
Strict volatility 0.90
Discovered by David Buckingham
Year of discovery 1980

Some variants of this shuttle are shown below. A 42-glider synthesis is known for one variant, 56P29.

A fully symmetric variant of this oscillator was first known to appear semi-naturally in December 2014, in a soup found by Richard Schank using apgsearch.[3]

Generation 4 reveals two pre-pulsars (black) being hassled by a 15-generation mechanism (green) and a 14-generation mechanism (red).
A slightly larger version of this oscillator, 56P29, with just one pre-pulsar (black) and an alternate 14-generation stabilization (red)
RLE: here
A much larger version of this oscillator with four pre-pulsars
RLE: here
gollark: As I said, I disagree with arbitrarily giving one group more power like that.
gollark: Sure, why not, those are nice numbers.
gollark: I do understand that it weights rural votes more highly. This is what I am complaining about.
gollark: So presumably it's 70% or whatever blue.
gollark: I mean, it doesn't look like 30% of the *squares* are blue, but I assume you're just saying that the thing deliberately skews towards redness regardless of population.

See also

References
  1. Dean Hickerson's oscillator stamp collection. Retrieved on December 8, 2019.
  2. "Class 2 Objects Catalog". Retrieved on June 10, 2009.
  3. Richard Schank (December 18, 2014). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  • 54P29.1 at Heinrich Koenig's Game of Life Object Catalogs
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