Doo-dah

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Doo-dah
x = 16, y = 28, rule = B3/S23 bo12bo$bo12bo$obo10bobo$bo12bo$bo12bo$2bo3b4o3bo$6b4o$2b4o4b4o2$4bo6bo $5b2o2b2o6$3b2o6b2o$2bob2o4b2obo$2bo2bo4bo2bo$3b3o4b3o$3b2o6b2o2$o14bo $o14bo$bo12bo$b2o10b2o$o14bo$b2o10b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 7 TRACKLOOP 21 0 -2/7 ZOOM 8 THUMBSIZE 2 ]]
Pattern type Spaceship
Number of cells 74
Bounding box 18×28
Direction Orthogonal
Period 21
Mod 21
Speed 2c/7
Speed (unsimplified) 6c/21
Heat 78.9
Discovered by John Winston Garth
Year of discovery 2020

Doo-dah is a period-21 tagalong for the 2c/7 orthogonal weekender spaceship, found by John Winston Garth on December 6, 2020. In its simplest phase, the tagalong part consists entirely of two R-pentomino descendants.[1][2] The spaceship was found using a combination of ikpx2 and apgsearch, with partial results from the former being inputted into the latter via ikpx2's "standard input" feature, with the goal of searching higher-period spaceships and puffers. Garth named the tagalong "doo-dah" after a nickname for his grandfather.[3]

A beehive puffer based on this spaceship was found the same day, seemingly independently by iNoMed[4] and GUYTU6J.[5] GUYTU6J also found a block puffer formed by adding a second weekender to the side of the p21 ship.[5] Both of these puffers can be either one- or two-sided. Various glider rakes have also been constructed.[6][7][8] On December 7, GUYTU6J and Aidan F. Pierce found several period-42 doo-dah-based spaceships.[9][10]

Goldtiger997 found that the p21 tagalong could be added to the weekender with six gliders,[11][2] while iNoMed found that each side could be turned into a beehive puffer with two gliders.[12][2] Finally, gooddogtyson and Blinkerspawn found that the p21 ship could be converted both to and from a puffer with just one glider each way, on each side.[13][14]

x = 52, y = 29, rule = B3/S23 2bobo42bobo$3b2o42b2o$3bo44bo10$19bo12bo$18b3o10b3o$17b5o8b5o$17b5o8b 5o$18bo6b2o6bo$19b3o3b2o3b3o$22bobo2bobo$24bo2bo$22bo6bo$23b6o$23bo4bo 3$7b2o34b2o$bo6b2o32b2o6bo$b2o4bo36bo4b2o$obo46bobo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
p21 tagalong being added with six gliders
(click above to open LifeViewer)
RLE: here Plaintext: here
x = 38, y = 29, rule = B3/S23 14bo12bo$13bobo10bobo$12bo3bo8bo3bo$13bo2bo8bo2bo$13bobo4b2o4bobo$14b 3o3b2o3b3o$17bo6bo$16bo2b4o2bo$20b2o$17b3o2b3o5$16bobo4bobo$15bo3bo2bo 3bo$16bob2o2b2obo10bo$17bob4obo10b2o$35bobo$18bo4bo$18bo4bo$12b3o4b4o 4b3o2$3o$2bo10bobo$bo12b2o12bo2$27b2o$28bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
Beehive puffer reaction being added to one side and removed from the other
(click above to open LifeViewer)
RLE: here Plaintext: here

References

  1. J. H. Yu (December 6, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  2. 2.0 2.1 2.2 Aidan F. Pierce (December 6, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  3. John Winston Garth (December 6, 2020). Message in #cgol on the Conwaylife Lounge Discord server
  4. iNoMed (December 6, 2020). Message in #cgol on the Conwaylife Lounge Discord server
  5. 5.0 5.1 GUYTU6J (December 6, 2020). Re: Thread For Your Useless Discoveries (discussion thread) at the ConwayLife.com forums
  6. Aidan F. Pierce (December 6, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  7. strix421 (December 6, 2020). Message in #cgol on the Conwaylife Lounge Discord server
  8. iNoMed (December 7, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  9. GUYTU6J (December 7, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  10. Aidan F. Pierce (December 7, 2020). Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums
  11. Goldtiger997 (December 6, 2020). Message in #cgol on the Conwaylife Lounge Discord server
  12. iNoMed (December 6, 2020). Message in #cgol on the Conwaylife Lounge Discord server
  13. gooddogtyson (December 6, 2020). Message in #cgol on the Conwaylife Lounge Discord server
  14. Blinkerspawn (December 6, 2020). Message in #cgol on the Conwaylife Lounge Discord server

External links