p42 glider shuttle

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p42 glider shuttle
p42 glider shuttle image
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