p42 glider shuttle

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p42 glider shuttle
x = 32, y = 32, rule = B3/S23 22b2o$21bo2bo$10bo13bo$9bobo12bo$10bo7bo3bobo$17bo3bobo$8b5o4bo4bo$7bo 4bo5b4o4b2o$6bob2o16b2o2b2o$3bo2bobo15b2obo2b2o$2bobobo9bo7b3o$3bo2bo 4b3o3b2o$6b2o3b2o3b2o$11bo13b2o$25b2o2$10bobo$5b2o4b2o$4bo2bo3bo7b2o$ 7bo10bo2bo2b2o$7bo10bobo4bo2bo$bo3bobo11bo5bobobo$o3bobo15b2obo2bo$o4b o16bo2bo$b4o4b2o8bo4bo$9b2o2b2o4b5o$7b2obo2b2o$7b3o11bo$20bobo$21bo$8b 2o$8b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 6 ZOOM 8 LOOP 42 ]]
Pattern type Oscillator
Oscillator type Shuttle
Number of cells 143
Bounding box 32×32
Period 42
Mod 21
Heat 56.1
Volatility 0.75
Strict volatility 0.33
Discovered by Noam Elkies
Year of discovery 1994

The p42 glider shuttle is a period 42 shuttle oscillator discovered by Noam Elkies in 1994. It was the first non-trivial period 42 oscillator to be discovered[1] and is based on a period 66 oscillator discovered by Robert Wainwright in September 1984. It works by using two copies of eater 3 and four copies of unix to shuttle two gliders back and forth. By increasing the distance between the two reflectors, oscillators of periods 42 + 24n can be created. Dean Hickerson found that the distance between the reflectors could be decreased using a custom period 6 oscillator to create a period 18 glider shuttle. In April 1992 Hickerson created another related oscillator by crossing two pairs of gliders using rephasers, which allowed the construction of oscillators of periods 246 + 24n.

Image gallery

A p18 glider shuttle using a custom period 6 oscillator by Dean Hickerson
RLE: here
A related p246 oscillator discovered by Dean Hickerson
RLE: here

See also


  1. Dean Hickerson's oscillator stamp collection. Retrieved on July 8, 2010.

External links