p26 pre-pulsar shuttle

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For other p26 pre-pulsar shuttles, see pre-pulsar shuttle#p26.
p26 pre-pulsar shuttle
x = 39, y = 39, rule = B3/S23 12b2o11b2o$12b2o3bo3bo3b2o$17bo3bo$17bo3bo$11bo15bo$10bobo13bobo$11bo 3b3o3b3o3bo$15bobo3bobo$15b3o3b3o2$5bo27bo$4bobo25bobo$2o3bo27bo3b2o$ 2o35b2o$16b2o3b2o$6b3o8bo3bo8b3o$6bobo5bo9bo5bobo$b3o2b3o5b2o7b2o5b3o 2b3o4$b3o2b3o5b2o7b2o5b3o2b3o$6bobo5bo9bo5bobo$6b3o8bo3bo8b3o$16b2o3b 2o$2o35b2o$2o3bo27bo3b2o$4bobo25bobo$5bo27bo2$15b3o3b3o$15bobo3bobo$ 11bo3b3o3b3o3bo$10bobo13bobo$11bo15bo$17bo3bo$17bo3bo$12b2o3bo3bo3b2o$ 12b2o11b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 6 ZOOM 8 LOOP 26 PAUSE 3 HEIGHT 400 ]]
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Pattern type Oscillator
Oscillator type Shuttle
Number of cells 144
Bounding box 39 × 39
Period 26 (mod: 26)
Heat 120.6
Volatility 0.95 | 0.95
Kinetic symmetry *c
Discovered by David Buckingham
Year of discovery 1983

p26 pre-pulsar shuttle is a period-26 pre-pulsar shuttle oscillator discovered by David Buckingham on January 18, 1983, and was the first period-26 oscillator to be found.[1] Its original 208-cell form is composed of four 14-generation pre-pulsar shuttle mechanisms using beehives as well as a central 12-generation pre-pulsar shuttle mechanism composed of four beacons. A 200-cell version that replaces the beehives with blinkers was found by Noam Elkies on April 22, 1997.[2] On November 17, 2016, Maia Karpovich found a smaller 14-generation pre-pulsar shuttle mechanism, resulting in a 144-cell variant of this oscillator.[3]

The 200-cell variant was the smallest known period-26 oscillator (in terms of minimum population) until the discovery of the p26 dependent reflector loop in February 2012. The smallest known period-26 oscillator is currently the p26 honey farm hassler, which has 60 cells.

The p26 pre-pulsar shuttle first occurred semi-naturally on April 17, 2024 by Charity Engine.[4]

Glider synthesis

On July 8, 2023, Chris857 found a 280-glider synthesis of the 144-cell form of the oscillator.[5][6] Over the next few days, he and Carson Cheng reduced the synthesis cost multiple times, down to 234 gliders.[7][8][9][10][11][12][13] On September 6, 2023, Chris857 lowered the synthesis cost to 226 gliders.[14][15] On March 24, 2025, KtT lowered the cost to 210 gliders.[16][17]

On October 27, 2024, Chris857 found a 490-glider synthesis of the original beehive-supported version of this oscillator.[18][19] He reduced the cost to 318 gliders later that day with a different catalyst synthesis found by KtT,[18][20] and further reduced it to 228 gliders the next day.[18][21] On March 24, 2025, KtT lowered the cost to 196 gliders.[16][17] On June 9, 2025, KtT further lowered the cost to 183 gliders.[22][23] On June 13, 2025, Chris857 brought the cost down to 162 gliders.[24][25]

On March 27, 2025, Chris857 found a 228-glider synthesis of the 200-cell blinker-supported version of the shuttle.[26][27] On June 9, 2025, KtT lowered the cost to 215 gliders.[22][23] On June 13, 2025, Chris857 brought the cost down to 194 gliders.[24][25]

Generation 4 reveals four pre-pulsars (black) being hassled by a 14-generation mechanism (green) and a 12-generation mechanism (red)
x = 40, y = 39, rule = B3/S23 17b2o3b2o$16bo2bobo2bo$12b2o3b2o3b2o3b2o$12bo15bo$9b2obo15bob2o$8bobob 2o13b2obobo$8bobo5b3o3b3o5bobo$6b2o2bo5bobo3bobo5bo2b2o$5bo4b2o4b3o3b 3o4b2o4bo$5b5o21b5o$9bo21bo$3b4o27b4o$3bo2bo27bo2bo2$17b2o3b2o$2bo4b3o 8bo3bo8b3o4bo$bobo3bobo5bo9bo5bobo3bobo$bobo3b3o5b2o7b2o5b3o3bobo$2bo 35bo2$2bo35bo$bobo3b3o5b2o7b2o5b3o3bobo$bobo3bobo5bo9bo5bobo3bobo$2bo 4b3o8bo3bo8b3o4bo$17b2o3b2o2$3bo2bo27bo2bo$3b4o27b4o$9bo21bo$5b5o21b5o $5bo4b2o4b3o3b3o4b2o4bo$6b2o2bo5bobo3bobo5bo2b2o$8bobo5b3o3b3o5bobo$8b obob2o13b2obobo$9b2obo15bob2o$12bo15bo$12b2o3b2o3b2o3b2o$16bo2bobo2bo$ 17b2o3b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ZOOM 8 HEIGHT 350 ]]
The original pre-pulsar shuttle 26
(click above to open LifeViewer)
RLE: here Plaintext: here
Catagolue: here
x = 37, y = 37, rule = B3/S23 16bo3bo$10b2o4bo3bo4b2o$10bo5bo3bo5bo$7b2obo15bob2o$6bobob2o13b2obobo $6bobo5b3o3b3o5bobo$4b2o2bo5bobo3bobo5bo2b2o$3bo4b2o4b3o3b3o4b2o4bo$3b 5o21b5o$7bo21bo$b4o27b4o$bo2bo27bo2bo2$15b2o3b2o$5b3o8bo3bo8b3o$5bobo 5bo9bo5bobo$3o2b3o5b2o7b2o5b3o2b3o4$3o2b3o5b2o7b2o5b3o2b3o$5bobo5bo9b o5bobo$5b3o8bo3bo8b3o$15b2o3b2o2$bo2bo27bo2bo$b4o27b4o$7bo21bo$3b5o21b 5o$3bo4b2o4b3o3b3o4b2o4bo$4b2o2bo5bobo3bobo5bo2b2o$6bobo5b3o3b3o5bobo $6bobob2o13b2obobo$7b2obo15bob2o$10bo5bo3bo5bo$10b2o4bo3bo4b2o$16bo3b o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ZOOM 8 HEIGHT 350 ]]
200-cell version with blinkers instead of beehives
(click above to open LifeViewer)
RLE: here Plaintext: here
Catagolue: here


See also

References

  1. ↑ Dean Hickerson's oscillator stamp collection.
  2. ↑ Jason Summers' all-osc oscillators collection
  3. ↑ Matthias Merzenich (November 17, 2016). Re: Soup Search Results (discussion thread) at the ConwayLife.com forums
  4. ↑ https://catagolue.hatsya.com/attribute/xp26_y7g33xexex33gzy6121w464x464w121zccw252y5ggxggy5252wccz0444w27y26401x1046y272w444z0222w4ey262goxog26y2e4w222z33w4a4yl4a4w33zy68k8w262x262w8k8zy8ccx7x7xcc/b3s23/D8_1
  5. ↑ Chris857 (July 8, 2023). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  6. ↑ shinjuku (#4618837345) (July 9, 2023). Job triggered by Adam P. Goucher at GitLab Catagolue project.
  7. ↑ Chris857 (July 9, 2023). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  8. ↑ Carson Cheng (July 9, 2023). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  9. ↑ Chris857 (July 10, 2023). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  10. ↑ shinjuku (#4619103056) (July 9, 2023). Job triggered by Adam P. Goucher at GitLab Catagolue project.
  11. ↑ shinjuku (#4619980608) (July 9, 2023). Job triggered by Adam P. Goucher at GitLab Catagolue project.
  12. ↑ shinjuku (#4620311580) (July 9, 2023). Job triggered by Adam P. Goucher at GitLab Catagolue project.
  13. ↑ shinjuku (#4620784392) (July 10, 2023). Job triggered by Adam P. Goucher at GitLab Catagolue project.
  14. ↑ Chris857 (September 4, 2023). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  15. ↑ shinjuku (#5026782587) (September 6, 2023). Job triggered by Adam P. Goucher at GitLab Catagolue project.
  16. ↑ 16.0 16.1 KtT (March 24, 2025). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  17. ↑ 17.0 17.1 shinjuku (#9504949982) (March 24, 2025). Job triggered by Adam P. Goucher at GitLab Catagolue project.
  18. ↑ 18.0 18.1 18.2 Chris857 (October 27, 2024). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  19. ↑ shinjuku (#8196598126) (October 27, 2024). Job triggered by Adam P. Goucher at GitLab Catagolue project.
  20. ↑ shinjuku (#8200332473) (October 28, 2024). Job triggered by Adam P. Goucher at GitLab Catagolue project.
  21. ↑ shinjuku (#8202196886) (October 28, 2024). Job triggered by Adam P. Goucher at GitLab Catagolue project.
  22. ↑ 22.0 22.1 KtT (June 7, 2025). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  23. ↑ 23.0 23.1 shinjuku (#10299799440) (June 10, 2025). Job triggered by Adam P. Goucher at GitLab Catagolue project.
  24. ↑ 24.0 24.1 Chris857 (June 13, 2025). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  25. ↑ 25.0 25.1 shinjuku (#10339568306) (June 13, 2025). Job triggered by Adam P. Goucher at GitLab Catagolue project.
  26. ↑ Chris857 (March 27, 2025). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  27. ↑ shinjuku (#9539072017) (March 27, 2025). Job triggered by Adam P. Goucher at GitLab Catagolue project.


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