p56 B-heptomino shuttle

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.

p56 B-heptomino shuttle
<html><div class="rle"><div class="codebox"><div style="display:none;"><code></html>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 ]] <nowiki>#C [[ LOOP 56 GPS 8 THUMBSIZE 2 ]]</nowiki> <html></code></div></div><canvas width="200" height="300" style="margin-left:1px;"><noscript></html> <html></noscript></canvas></div></html>
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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
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
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gollark: You forgot strange kek, charm kek, up kek and down kek!
gollark: What if we make it so that proposals are *automatically* passed when the rules state they should be, and directly patch the code of the bot?
gollark: What if we make it so that votes are done by allowing each player to set a few cells of the initial state to a complex cellular automaton, and then the output of that after a few billion steps is parsed into the result of the vote?
gollark: Wait, what if we treat passing/failing proposals as a 1D cellular automaton?

See also

Notes
  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.

References
  1. Dean Hickerson's oscillator stamp collection.
  2. Jason Summers' all-osc oscillators collection
  • 45P56.1 at Heinrich Koenig's Game of Life Object Catalogs
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