p56 B-heptomino shuttle

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p56 B-heptomino shuttle
x = 26, y = 21, rule = B3/S23 23b2o$23b2o3$6b2o16b2o$6b2o14bob2o$22bo$22bo$22bo2bo$6bo16b2o$5bob2o$b 2o2bo2bo$b2o5bo3$2b2o14b2o$ob2o14b2o$o$o$o2bo$b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ LOOP 56 GPS 8 THUMBSIZE 2 ]]
Pattern type Oscillator
Oscillator type Shuttle
Number of cells 45
Bounding box 28×21
Period 56
Mod 28
Heat 30.3
Volatility 0.94
Strict volatility 0.57
Discovered by David Buckingham
Year of discovery Unknown

P56 B-heptomino shuttle is a period-56 oscillator discovered in its original form (shown below) by David Buckingham sometime before May 1991,[1] being the first period 56 oscillator to be found.[note 1] It consists of a B-heptomino being hassled by two blockers and two blocks. In terms of its 45 cells, it is the smallest known period 56 oscillator.[2] The blockers interact with the B twice, once to supress the block, and another time to prevent the formation of a Herschel.

Image gallery

Generation 8 reveals that the object being hassled is a B-heptomino.
The original form of this oscillator using Kok's galaxies instead of blockers
RLE: here

See also


  1. A period-56 oscillator, Kok's galaxy on 44P7.2, can be constructed from two sparkers (Kok's galaxy and 44P7.2) both of which were definitely known by 1977. However, this type of oscillator is generally considered "boring", and thus not counted despite technically being non-trivial.


  1. Dean Hickerson's oscillator stamp collection.
  2. Jason Summers' all-osc oscillators collection

External links

  • 45P56.1 at Heinrich Koenig's Game of Life Object Catalogs