Pre-pulsar shuttle 29

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Pre-pulsar shuttle 29
x = 18, y = 27, rule = B3/S23 11b2o$11bo$13bo$9b5o$9bo$12b4o$12bo2bo2$bo$obo6b3o4bo$bo7bobo3bobo$9b 3o3bobo$16bo2$16bo$9b3o3bobo$bo7bobo3bobo$obo6b3o4bo$bo2$12bo2bo$12b4o $9bo$9b5o$13bo$11bo$11b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 5 ZOOM 10 LOOP 29 ]]
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.

A 42-glider synthesis is known for a variant of this oscillator, 56P29, which is shown below.[3]

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


External links

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