Pre-pulsar shuttle 29

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Pre-pulsar shuttle 29
x = 28, y = 28, rule = B3/S23 15bo$13b3o$12bo$12b2o2$bo$obo5bo6bo$bo4b2o8bo$8bo7bo$15bo2$19b2o$8bo9b o2bo4b2o$bo4b2o18bo$obo5bo15bobo$bo22b2o4$13bobo3bobo$14bo5bo$14bo5bo 4$13bo7bo$12bobo5bobo$13bo7bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]]
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

Pre-pulsar shuttle 29 (or prime[citation needed]) 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, and some variations of this shuttle are shown below. In September 1994 Bill Gosper found that two copies of pre-pulsar shuttle 29 could be used to hassle a pentadecathlon. Gosper used it to construct the P58 toadsucker.

Image gallery

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

See also


  1. Dean Hickerson's oscillator stamp collection. Retrieved on June 16, 2009.
  2. "Class 2 Objects Catalog". Retrieved on June 10, 2009.

External links

  • 54P29.1 at Heinrich Koenig's Game of Life Object Catalogs