Period-21 traffic light hasslers

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Main article: Traffic light hasslers

All known period-21 traffic light hasslers.

x = 40, y = 44, rule = B3/S23 21b2o$20bobo$20bo$16bob2ob4o$16b2obobo2bo2$16b3obo$16bo3bo$17b2o$12bo 2bobo$12b4obob2ob2ob2o$17bo3bobobo$14b3o4bobo2bo$14bo2b5ob3obo$17bo4b o4bo$18b3obob3o$14bo5b2ob2o4b2o$10b2obobo13b2o$10b2obobo$3b2o8bob2o6b obo$3bo6b4o3bo4bo$2obo5bo4bob2o4bo3bo$o2b2o4b2ob2o3bo4bo3bob3o$b2o3bo 2b2o4b2o5bo5bobo7bo$3bob2o2b3obobo7bobo2b3o6bobo$3bo2bobo2bo3bo17b2o2b obo$4bobob4ob2o17bobo3bo$3b2ob2o4bo7b2ob2obo5bo$9b2obo5b3obob2obobo3b 5o$10bob2o3bo4bo4bob4o$8bo5bo2b5ob2obobo3bo2b4o$8b2o4b3o4bobob2o2bo5b o$17bo3bobo4b2o6bo2bo$14b2obob2ob2o13bobo$12bo2bobo20bo$12b2o3b2o$16b o3bo$16b3obo2$16b2obobo2bo$16bob2ob4o$20bo$20bobo$21b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 HEIGHT 500 ]]
found by David Raucci (WHEN?) [1] in dimer form; monomerised by Period1GliderGun on October 4, 2026 [2]
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Catagolue: here
#O Robert Wainwright, February 21, 1995 #C The first period 21 oscillator to be found. x = 36, y = 25, rule = B3/S23 11b2o9bo13b$12bo9bo13b$11bo10bo13b$11b4o6b2o13b$9b2o4bo3bo16b$5b2obobo b3o3bo4bo12b$5b2obo3bo5bo17b$8b2o10b3o13b$5b3o28b$4bo2bo23bo4b$4b2o14b o9bobo3b$ob2o10b3o2bobo8bobo3b$2obob2o22b2obob2o$3bobo8bobo2b3o10b2obo $3bobo9bo14b2o4b$4bo23bo2bo4b$28b3o5b$13b3o10b2o8b$17bo5bo3bob2o5b$12b o4bo3b3obobob2o5b$16bo3bo4b2o9b$13b2o6b4o11b$13bo10bo11b$13bo9bo12b$ 13bo9b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 HEIGHT 500 ]]
124P21
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RLE: here Plaintext: here
Catagolue: here
7b2o19b2o$2o6b3o15b3o6b2o$o5bo4bo13bo4bo5bo$b3obob3obo13bob3obob3o$3bobobo21bobobo$4b2o2bo19bo2b2o$7bo21bo$2bo4bo21bo4bo$bobo3bo2bo15bo2bo3bobo$bobo3bo2bo15bo2bo3bobo$2bo4bo9b3o9bo4bo$7bo9bobo9bo$4b2o2bo8b3o8bo2b2o$3bobobo21bobobo$b3obob3obo13bob3obob3o$o5bo4bo4bo3bo4bo4bo5bo$2o6b3o4b2o3b2o4b3o6b2o$7b2o6b2o3b2o6b2o$12b2o2bo3bo2b2o$10b3o2b3ob3o2b3o$9bo4bo2bobo2bo4bo$10b5obo3bob5o$16b2ob2o$9bob5o5b5obo$9b2obobob2ob2obobob2o$14bobo3bobo$13b2o2bobo2b2o$16b2ob2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 HEIGHT 500 ]]
found by unknown person (APPROXIMATELY WHEN?) [1]
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Catagolue: here
17bo$12b2o3b2o$12b2o3b2o$17bo$15bo2bo$15bob3o$14b2o3bo$13bo3b2o$13b3obo$14bo2bo$15bo$14b2o3b2o14bobo3b2o$14b2o3b2o13bo2bo2bo2bo$15bo17bo9bo$32b4o4bo2bo$30b2o3b4o3b2o$23b3o4bo2bo4b4o$23b3o4bo9bo$5bobo3b2o10b3o4bo2bo2bo2bo$4bo2bo2bo2bo4b3o10b2o3bobo$3bo9bo4b3o$2b4o4bo2bo4b3o$2o3b4o3b2o$o2bo4b4o$o9bo17bo$o2bo2bo2bo13b2o3b2o$b2o3bobo14b2o3b2o$28bo$26bo2bo$26bob3o$25b2o3bo$24bo3b2o$24b3obo$25bo2bo$26bo$25b2o3b2o$25b2o3b2o$26bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 HEIGHT 500 ]]
found by unknown person (WHEN?) [1]
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Catagolue: here
x = 80, y = 28, rule = B3/S23 6bobobob2o5bo$5bob2ob2obo4bobo$5bo3bo9bo10b2o$3b2ob2o3b2o16bo2bobo$2bo bobob3obo16bob2ob3o8bo4b2o$2bobo3bo7b3ob3obo3b2o2bo4bob2o3bobo2bo2bo$ 2ob2o3bo8b2o2b2ob2obo2bobob3o3bo2bobo4bobo$bobob4o2b2ob3o3b2o4bo2bobob 2o2b2o4bo2b5ob2o$bobobob4obobo2b2o7bo9bo2b4obobo24b2o$2ob3o4bobo2b2o2b 2o6b2o3b4obo4bobo4b3obo7bo7b3o6b2o$2bo3bobobo2b2o2bobo13bo3b4obob2o2bo 4bo7bo6bo4bo5bo$2bob2ob2obo5bo2bo11b3o3bo7bob2obo2bo7bo7b4obob3o$3bobo 3bo7b2o18bobo7bo5bo20bobo$6b2o22bo9bo8bo4bo14b3o2b2o$7b2o21bo9bo8bo4bo 14b3o2b2o$3bobo3bo7b2o18bobo7bo5bo5b3o7b3o3bobo$2bob2ob2obo5bo2bo11b3o 3bo7bob2obo2bo5bobo7b3ob2obobo$2bo3bobobo2b2o2bobo13bo3b4obob2o2bo4bo 5b3o7b3ob2obobo$2ob3o4bobo2b2o2b2o6b2o3b4obo4bobo4b3obo15b3o3bobo$bobo bob4obobo2b2o7bo9bo2b4obobo22b3o2b2o$bobob4o2b2ob3o3b2o4bo2bobob2o2b2o 4bo2b5ob2o15b3o2b2o$2ob2o3bo8b2o2b2ob2obo2bobob3o3bo2bobo4bobo21bobo$ 2bobo3bo7b3ob3obo3b2o2bo4bob2o3bobo2bo2bo16b4obob3o$2bobobob3obo16bob 2ob3o8bo4b2o16bo4bo5bo$3b2ob2o3b2o16bo2bobo34b3o6b2o$5bo3bo9bo10b2o39b 2o$5bob2ob2obo4bobo$6bobobob2o5bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 HEIGHT 500 ]]
Found by Period1GliderGun on December 28, 2024[3]. Uses a 408P7.
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Catagolue: here
x = 91, y = 47, rule = B3/S23 64bobo$61bo2b2obo$61b3o3bo$65b2ob2obo$63b2obobob2o$63bo2bo$64b4o$61b3o $61bo2b5o$62bobo4bo$61b2obo5bob2o$10bo45b2o3bo2bobobobob2o$8b3o21bobo 22bo4b2o2bo3bo15b2ob2o$2b2o3bo10bo13b2obo4b2o13bo8b2ob2ob4o9b2o2bobo$ 2bo4bo2b3o4bobob2o7b2o3bo5bo12bob4o4bo3b2o4bob2o5b3o4bo$3b3obobo2bo4b obobobob2o2bo3b2ob2obo15bo3bo5b3o3b4obo5bo3b4o$5bobob2o5b2obo3bobobo2b 3obobob3o16bo9bobobo5bo$b3obobobo6bo2bo2b2o3b3o4bobo5b2o12b3o9b3o3b3o 3bo5b2o$o2b2o2bobob2o5b2obo3bo4bob3o3b4o2bo14bo9bo3bo6bo4bo2bo$2o17bo b2obob2o2bo4bobo5b2o9bo3b2o13b2o3b2o2b2o3b2o$10b5obob2obo4b2ob4o7b2ob obob2obo2bob2obo4bo16b2o$3bobo7b2o2b3o2bo3bo3bo8bo3bob2o4bobo2bobo2b2o bo15b2o$b3ob3o6bo2b3o2bo3b2o2b2o7bo12bo3bobobo2b3o4b3o7b2o$o7bo5bob5o 5b2o2b3o5bo8bo4bobobob3o2b3o4bobo7b2o$b3ob3o6bo2b3o2bo3b2o2b2o7bo12bo 3bobobo2b3o4b3o7b2o$3bobo7b2o2b3o2bo3bo3bo8bo3bob2o4bobo2bobo2b2obo15b 2o$10b5obob2obo4b2ob4o7b2obobob2obo2bob2obo4bo14b2o2b2o3b2o$2o17bob2o bob2o2bo4bobo5b2o9bo3b2o13b2o5bo4bo2bo$o2b2o2bobob2o5b2obo3bo4bob3o3b 4o2bo14bo9bo3bo6bo5b2o$b3obobobo6bo2bo2b2o3b3o4bobo5b2o12b3o9b3o3b3o$ 5bobob2o5b2obo3bobobo2b3obobob3o16bo9bobobo5bo4bo3b4o$3b3obobo2bo4bob obobob2o2bo3b2ob2obo15bo3bo5b3o3b4obo6b3o4bo$2bo4bo2b3o4bobob2o7b2o3b o5bo12bob4o4bo3b2o4bob2o5b2o2bobo$2b2o3bo10bo13b2obo4b2o13bo8b2ob2ob4o 12b2ob2o$8b3o21bobo22bo4b2o2bo3bo$10bo45b2o3bo2bobobobob2o$61b2obo5bo b2o$62bobo4bo$61bo2b5o$61b3o$64b4o$63bo2bo$63b2obobob2o$65b2ob2obo$61b 3o3bo$61bo2b2obo$64bobo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 HEIGHT 500 ]]
p21, found by Caleb R. Hilton on December 14, 2024.[4] Also a pi-heptomino hassler.
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RLE: here Plaintext: here
Catagolue: here
x = 39, y = 29, rule = B3/S23 24b2o$26bo2b2o$26bo2b2o$25b2o$23bo$23bobobo$23bo3b2o$24b2o3bo$25bobob o$29bo$26b2o$6b2o14b2o2bo$2b2obo2bo13b2o2bo$3bobob2o18b2o$3bobobo$2ob 3o$obo3bo4b2o4b3o$3b4o3b2obobobobo$7b2o4bobob3o6b2o5bo$3b2o2bob4o13b2o 4b2o$3bobobobo20b2o$4b2obob4o7bo6bo2b3ob2o2bo$8bo3bo7bo5b3obo2bob3o$9b o8bob2o3bo2b2ob3o2bo$8b2o7b2o13b2o$21bo8b2o4b2o$20b2o8bo5b2o$21b2o$20b 3o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 HEIGHT 500 ]]
Found by Entity Valkyrie on October 7, 2026.[5]
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Catagolue: here


References

  1. ↑ 1.0 1.1 1.2 Cite error: Invalid <ref> tag; no text was provided for refs named post
  2. ↑ Period1GliderGun (October 4, 2026). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
  3. ↑ Period1GliderGun (December 30, 2024). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
  4. ↑ Caleb R. Hilton (December 14, 2024). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
  5. ↑ Entity Valkyrie (October 7, 2026). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums