145P20

145P20 is an unnamed period-20 oscillator. It was the first non-trivial period 20 oscillator to be found,[note 1] and was discovered by Noam Elkies on March 22, 1995.[1]

145P20
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Pattern type Oscillator
Number of cells 145
Bounding box 28×21
Period 20
Mod 20
Heat 72.8
Volatility 0.60
Strict volatility 0.18
Discovered by Noam Elkies
Year of discovery 1995

It works by using sparks from three period 4 middleweight emulators and the period 5 middleweight volcano to hassle a traffic light predecessor. The middleweight emulator on the left can be replaced with a middleweight volcano.

Notes
  1. A period-20 oscillator, heavyweight emulator on octagon II, can be constructed from two sparkers (heavyweight emulator and octagon II) both of which were known by 1980. However, this type of oscillator is generally considered "boring", and thus not counted despite technically being non-trivial.
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References
  1. Dean Hickerson's oscillator stamp collection.
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