117P18

117P18 is an unnamed period-18 oscillator. It was the first period 18 oscillator to be found,[note 1] and was discovered by David Buckingham no later than May, 1991.[1]

117P18
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Pattern type Oscillator
Number of cells 117
Bounding box 39×30
Period 18
Mod 9
Heat 102.9
Volatility 0.86
Strict volatility 0.10
Discovered by David Buckingham
Year of discovery Unknown

It consists of two extended snackers and two blocks used to hassle an R-pentomino.

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113P18
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Notes
  1. A period-18 oscillator, unix on snacker, can be constructed from two sparkers (unix and snacker) both of which were definitely known by 1976. However, this type of oscillator is generally considered "boring", and thus not counted despite technically being non-trivial.
gollark: Yes it does.
gollark: `-t` requires an argument, honestly.
gollark: Because it's a cheap .tk domain?
gollark: You're going down.
gollark: Your IP has been traced to 127.0.0.1.

References
  1. Dean Hickerson's oscillator stamp collection. Retrieved on April 11, 2009.
  • 117P18.1 at Heinrich Koenig's Game of Life Object Catalogs
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