p40 B-heptomino shuttle

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p40 B-heptomino shuttle
x = 26, y = 23, rule = B3/S23 b2o20b2o$o2bo19b2o$o$o$ob2o20b2o$2b2o18bob2o$22bo$22bo$b2o13b2o4bo2bo$ b2o12bo2bo4b2o$15bo2bo$14b2ob2o$15b2o2$7bo10bo$6bobo8bobo$7bo4b2o4bo$ 10bo4bo$10bo4bo$10bo4bo$11bo2bo$9bobo2bobo$9b2o4b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 8 ZOOM 10 ]]
Pattern type Oscillator
Oscillator type Shuttle
Number of cells 68
Bounding box 28 × 23
Period 40 (mod: 20)
Heat 44.2
Volatility 0.88 | 0.45
Kinetic symmetry n-e
Discovered by David Buckingham
Year of discovery Unknown

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.

Martin Grant found a 29-glider synthesis in October 2013.[2] On October 21, 2024, Chris857 lowered the cost to 25 gliders.[3][4]

Image gallery

Generation 17 reveals that the object being hassled is a B-heptomino

See also

Notes

  1. A nontrivial period-40 oscillator, such as octagon II on figure eight, could have been constructed from two oscillators of lower period (such as p5 and p8), both of which were known by an earlier date. However, no such LCM oscillators were attested prior to the discovery of this oscillator on or before 1991.

References

  1. Dean Hickerson's oscillator stamp collection.
  2. Martin Grant (October 11, 2013). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  3. Chris857 (October 17, 2024). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  4. shinjuku (#8138669964) (June 11, 2023). Job triggered by Adam P. Goucher at GitLab Catagolue project.

External links