p40 B-heptomino shuttle

P40 B-heptomino shuttle is a period-40 shuttle oscillator found by David Buckingham sometime before May 1991,[1] being the first period 40 oscillator to be discovered.[note 1] It consists of two blockers, two tubs, and a fumarole hassling a B-heptomino.

p40 B-heptomino shuttle
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Pattern type Oscillator
Oscillator type Shuttle
Number of cells 68
Bounding box 28×23
Period 40
Mod 20
Heat 44.2
Volatility 0.88
Strict volatility 0.45
Discovered by David Buckingham
Year of discovery Unknown
Generation 17 reveals that the object being hassled is a B-heptomino.
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See also

Notes
  1. A period-40 oscillator, octagon II on figure eight, can be constructed from two sparkers (octagon II and figure eight) both of which were definitely known by 1971. However, this type of oscillator is generally considered "boring", and thus not counted despite technically being non-trivial.

References
  1. Dean Hickerson's oscillator stamp collection.
  • 68P40.1 at Heinrich Koenig's Game of Life Object Catalogs
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