Period-24 glider gun

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Period-24 glider gun
x = 43, y = 32, rule = B3/S23 23bo2bo$21b6o$17b2obo8bo$13b2obobobob8o2bo$11b3ob2o3bobo7b3o$10bo4b3o 2bo3bo3b2o$11b3o3b2ob4obo3bob2o$12bobo3bo5bo4bo2bo4b2obo$10bo8bob2o2b 2o2b2o5bob2obo$10b5ob4obo4b3o7bo4bo$15b2o4bo4bob3o2b2obob2ob2o$12b5ob 3o4b2ob2o3bobobobobo$11bo5b2o4b2obob2o5bo5bo$12b5o6b2obo3bo3bobob2ob2o $2ob2o9b2o2bo5bobo4bo2b3obobo$bobobobob2o3b3obo6bo2bobo4b3o2bo$o2bo7bo 6b2o3b3o8bobob2o$3o2bo4b2o11bo10bo$5b4obo17b2o4b2o$2b2obo6bo14bo3bo2b 2o$bo4bo3bo16bo6b2o$b3obo4bo16bo3bo2bo$11bo2bo3bo9b2o4bobob2o$b3obo4bo 8b2o3bo10b3o2bo$bo4bo3bo7bo6bo8b3obobo$2b2obo6bo10b3o8bobob2ob2o$5b4ob o24bo5bo$3o2bo4b2o21bobobobobo$o2bo7bo9b2o10b2obob2ob2o$bobobobob2o10b o8bo5bo4bo$2ob2o17b3o6bo4bob2obo$24bo4b3o5b2obo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ ZOOM 8 AUTOSTART OFF ]]
View static image
Pattern type Gun
Number of cells 335
Bounding box 43 × 32
Period 24
Barrels 1
Discovered by Noam Elkies
Year of discovery 1997

A period-24 glider gun is any true period 24 glider gun.

The first true period 24 glider gun was discovered by Noam D. Elkies in 1997.[1] It uses four large period-4 oscillators (two of them variants of fountain, the other two adjoined by common casing) to hassle two T-tetrominoes, which react together to produce gliders. The form on the right is a reduced variant found by Karel Suhajda.[2] The eater 1 can be replaced with a unix for compacting purposes, such as in earlier versions of the period-48 glider gun.

No more than five days after the initial discovery, Elkies found a method to double the period of the gun, resulting in the first known period 48 glider gun.[1] A smaller version was found in 2016 by Tanner Jacobi, using Rich's p16 to double the period.[3]

x = 71, y = 46, rule = B3/S23 8b2o9b2o$9bo9bo$8bo11bo$8b2o9b2o$12b2ob2o$6b3obo7bob3o$5bo2b2o4bo4b2o 2bo$5b2o4b7o4b2o$11bobobobo$13bobo$9b3o5b3o$8bobobo3bobobo$8b2o2b5o2b 2o14bo2bo$27b2o2bob3o2b3obo19bo$23b2o3bo2b2o8b2o7b2o5bo3bobo$13bo10bo 2bo6b6o3b2o4bobo4bobo3bo$12b3o9bobob6o6b3o2bo3bo6bobo$23b2obobo4bob2ob 2o4bo2b2obo4b2obob5o$23bo3b3o3b2o5bo4b2obobo3bo2bobo4bo$19b2ob3o2bob2o bo2bo2b3o5bo2bo3b3o3bo2b2o$18bo2b5obobo4b4o2bobobobo2bo2b2o2bobo$2b2o 13bo8b2obobo5bob2obo3bobo3b3ob5ob2o4b3o$3bo6b2o4b3o3b2o3b2obo2b2o2bobo 3bo8b2o4b2o4bo2b3o$3bobo3b2o5b2o3bo2b3o6b2o4bobobo2b2o2b2obo6bo2bo$4b 2o5bo6bob2o5bob2o4bobo2b3obobobo2bob3obo3bobo$18b4o4bobo6b2obo2b2o2bob 2obo2bobo5bobo$18bo2bo4bo2bo6bo2b2o3b2o2bob2o2bo2b3o4bo2b3o$10bo7bo3bo 3b3obob4o2bo3bo3bobo6b2o3b4o4b3o$10bo7bo4bob2o2b3o3bo2b2o3bobob2o8bobo $9bobo6bob2o2bobob7obobo2bobobo11bobo2b2o$10bo6b2o3bobobo7bobo2b3ob2o 2b2o9bo3b2o$10bo10b3obo2bo4bo2b3o9bo$26bobobo2bobo3bo6bo$3b2o9b2o4bob 4o2bob3o2bo2b2o6b2o$3bo2b7o2bo4b2obo4b2o5b2o$4bo3b3o3bo16b2o$5bo2bobo 2bo14b3obo$28bo$2o4b3ob3o4b2o$o2b2o2bobobo2b2o2bo$b3ob3o3b3ob3o$6b2obo b2o$3b2o9b2o$3bo11bo$4bo9bo$3b2o9b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 24 THUMBSIZE 2 ZOOM 6 HEIGHT 400 ]]
Original period-24 glider gun
(click above to open LifeViewer)
RLE: here Plaintext: here
x = 47, y = 41, rule = B3/S23 17b2o11b2o$16bo2bo9bo2bo$16bobo3b2ob2o3bobo$14b2o2bobo7bobo2b2o$15bobo bo4bo4bobobo$14bo2b2o2b7o2b2o2bo$14b2o5bobobobo5b2o$23bobo$5bo2b2o9b3o 5b3o$4bobo2bo2bo5bobobo3bobobo$4bob2obobobo4b2o2b5o2b2o$3b2obo2bobo2bo $3bo2bob2o2bo$4b3obobo3b3o$6b2obo5b2o$2bobo2bobo3bo2bo4bobobo$2b2o2b2o bob2o2b3o4b3o13b2o$8b2obo3b2o6bo13bo2bo$2b5o4bo24b2o$bo4bob3o17b2o5b3o 5bo$bob2obobo6b2o7bo3bobo4bo2bo3bobo$2obo2bo6b4o8bo4bo5b3o3b2o$bobobob o5b2o2bo5b3o4b2o$bobob2obo2bo24b3o3b2o$2ob2o2b2o3b4o19bo2bo3bobo$3bo2b 3o2bo2b2o4bo14b3o5bo$3bobob2o5bo4bobo8bo5b2o$2b2obo2b2obo2bo3bo3bo8bo 5bo2bo$4bo3b2o2bo2bo3bobo7b3o6b2o$4bobo7bo5bo$3b2ob2o10b3o$10b2o4b7o4b 2o$10bo2bo2b2obob2o2bo2bo$11b2ob4o3b4ob2o$8b3o2bo11bo2b3o$7bo3b2ob2o7b 2ob2o3bo$7b2obo3b2o7b2o3bob2o$8bob3o3bo5bo3b3obo$7bo6b2o7b2o6bo10bo$8b 6o11b6o12bo$10bo2bo11bo2bo12b3o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 24 THUMBSIZE 2 ZOOM 8 HEIGHT 400 ]]
A p48 glider gun
(click above to open LifeViewer)
RLE: here Plaintext: here
x = 84, y = 89, rule = B3/S23 14bob2o9b2obo$14b2obo2b2ob2o2bob2o$17bobobobobobo$14b3obo7bob3o$14bo2b obo5bobo2bo$17b4o3b4o$16bo3bo3bo3bo$17b2o7b2o2$16b4o5b4o24bob2o9b2obo$ 5bo2b2o5bob2o2b3o2b2obo23b2obo2b2ob2o2bob2o$4bobo2bo2bo3b2ob7ob2o27bob obobobobo$4bob2obobobo18bo20b3obo7bob3o$3b2obo2bobobo17bob4o16bo2bobo 5bobo2bo$3bo2bob2obo3bo14bobob3o19b4o3b4o$5b2obo7bo12bobo23bo3bo3bo3bo $3bo5bo3bobo14bo25b2o7b2o$2bo4bobo6bo13b2o$2b2ob3obob3ob2o6bo6b2o23b4o 5b4o$8b2obo4bo5b3o5b2o22bob2o2b3o2b2obo5b2o2bo$2b5o4bo43b2ob7ob2o3bo2b o2bobo$bo4bob3o40b2o17bobobob2obo$bob2obobo38b2o2b2o17bobobo2bob2o$2ob o2bo5bob4o6bo22b2o2bob2o13bo3bob2obo2bo$bobobobo3bo2bo10b2o25b3o12bo7b ob2o$bobo2bobo7bo7b2o42bobo3bo5bo$2ob2o2b2o2b5o4bo46bo6bobo4bo$3bo10bo 4b3o30b2o5b3o5b2ob3obob3ob2o$3bobobo4bo5bobobo29b2o5bobo5bo4bob2o$2b2o b4o4b2o15bo28b3o10bo4b5o$4bo3bobob3o16b2o40b3obo4bo$4bobo7bo15b2o43bob ob2obo$3b2ob2o58b4obo5bo2bob2o$10b2o5b5o5b2o29bo10bo2bo3bobobobo$10bo 2b2ob2o3b2ob2o2bo27b2o5bo3bo7bobo2bobo$11b2o13b2o8bo20b2o3b3o3b5o2b2o 2b2ob2o$8b3o2bo2bo2bo2bo2bo2b3o6b2o23b3o4bo10bo$7bo3b2o13b2o3bo4b2o33b o4bobobo$7b2obo2b2obo5bob2o2bob2o37b2o4b4ob2o$8bob4o2bo5bo2b4obo21bo 16b3obobo3bo$7bo6b2o7b2o6bo18b2o17bo7bobo$8b6o11b6o11bo8b2o23b2ob2o$ 10bo2bo11bo2bo14b2o10b2o5b5o5b2o$42b2o11bo2b2ob2o3b2ob2o2bo$56b2o13b2o $46bo6b3o2bo2bo2bo2bo2bo2b3o$7b4o8b4o8b4o9b2o6bo3b2o13b2o3bo$7bo3bo7bo 3bo7bo3bo9b2o5b2obo2b2obo5bob2o2bob2o$7bo11bo11bo8b3o10bob4o2bo5bo2b4o bo$8bo2bo8bo2bo8bo2bo4bo11bo6b2o7b2o6bo$41bo11b6o11b6o$55bo2bo11bo2bo$ 66b2o$66b2o$46b3o$46bo20bo$47bo18bobo$40bob2o17b2o2bo2bo$39bob2obo16b 2obo11b2ob2o$39bo4bo20b2o3b2obobobobo$38b2ob2obob2o4b3o14bo7bo2bo$39bo bobobobo4bo16b2o4bo2b3o$39bo5bo7bo7b2o7bob4o$38b2ob2obobo21bo6bob2o$ 40bobob3o11bo5bo5bo3bo4bo$40bo2b3o8bo3bo5bobo3bo4bob3o$41b2obobo6b6o5b o4bo$46bo5bobobo13bo4bob3o$45b2o4b3ob3o2b3o7bo3bo4bo$45b2o5bo2bo12bo6b ob2o$45b2o6bo7b2o7bob4o$46bo10bo11b2o4bo2b3o$41b2obobo8b3o3b2o6bo7bo2b o$40bo2b3o4bobo2bo6bob3o3b2obobobobo$40bobob3o2bo4bobo5bo2b2o9b2ob2o$ 38b2ob2obobo3bo3bob2o6b5o$39bo5bo5b2obob2o4b2o5bo$39bobobobobo3b2ob2o 4b3ob5o$38b2ob2obob2o2b3obo4bo4b2o$39bo4bo7b3o4bob4ob5o$39bob2obo5b2o 2b2o2b2obo8bo$40bob2o4bo2bo4bo5bo3bobo$48b2obo3bob4ob2o3b3o$51b2o3bo3b o2b3o4bo$48b3o7bobo3b2ob3o$48bo2b8obobobob2o$51bo8bob2o$54b6o$54bo2bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 24 THUMBSIZE 2 ZOOM 6 HEIGHT 600 ]]
A p24 LWSS gun, used in broken lines
(click above to open LifeViewer)
RLE: here Plaintext: here

Other period-24 glider guns

In January 2019, a smaller period-24 gun was assembled by Tanner Jacobi and Matthias Merzenich, based on the dueling banjos oscillator[4] (see animation below). It was further reduced in November of that same year due to the discovery of a new p6 domino sparker by Dongook Lee.[5][6] Both of these variants have been used to create period-48 LWSS guns,[7][8] and the former gun was in turn used to create a pseudo-period 16 glider gun.[9]

x = 40, y = 31, rule = B3/S23 5b2ob2o4b2o3b2o4b2ob2o$5b2obobo3b2o3b2o3bobob2o$8bo5bobobobo5bo$8bo2bo 11bo2bo$9bo15bo$3bobo7bob2ob2obo$b3ob3o5bo2bobo2bo$o7bo4b3o3b3o7b2o3bo $bob6o19bo2bobobo2bo$b2o4bo20bob2obob4o$3bo3b2o18b2o4bo$2bobo2bobo10bo 4bo3b4ob2ob2o$3bo2bo13bo7bobobobobo2bo$6bo3bo2b2o9bo3bo3bo2bo2b2o$6bo 3bo2b2o9bo6b2o$6bo6bo14b3obo2bo$6bo2bo11bo3bo4bo2b3o$7bo14bo4b2obobo$ 5bobobo10b3o5bobo2b3o$4bobob2o18bobo4bo$4bobo6b5o11bo$5b2o4b3obob3o$ 10bo4bo4bo6bo$10bob2o2bob2obo6bo$11bo2b2o3bobo4b3o$12b2o2bo2bob2o$14bo 4bobo2bo$14b4ob2o2b2o$18bo14bo$16bobo15bo$16b2o14b3o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 24 THUMBSIZE 2 ZOOM 8 HEIGHT 450 ]]
A smaller p24 gun based on dueling banjos
(click above to open LifeViewer)
RLE: here Plaintext: here
x = 69, y = 66, rule = B3/S23 10b2ob2o15b2ob2o$10b2obo5bo5bo5bob2o$13bo4b2o5b2o4bo$13b2o2bo9bo2b2o$ 18b2obobob2o$8bobo8b3ob3o11b2o$6b3ob3o23bobo$5bo7bo22b3o$6bob6o21bo$6b 2o4bo5bo7bo7bob4o$8bo3b2o3b4o3b4o4b2obo4bo$7bobo2bobo2bo3bobo3bo3bobob ob2obob3o$8bo2bo6bo2bobo2bo4b3obob2obobobo$11bo3bo2b3o3b3o8bo4bob2o$ 11bo3bo20b4obo6b2ob2o3b2ob2o$11bo28bo6bo5bobo5bo$11bo2bo22b3o12b2ob2o$ 12bo24bobo10bo7bo$10bobobo22b2o8bo2bob2ob2obo2bo$9bobob2o14bo18bo3bo3b o3bo$9bobo6b5o7bo18b2ob2ob2ob2o$10b2o4b3obob3o3b3o19bo2bobo2bo$15bo4bo 4bo25bobobobo$15bob2o2bob2obo25bo3bo$16bo2b2o3bobo$17b2o2bo2bob2o7bo$ 12b2o5bo4bobo2bo6bo$8b2obobo5b4ob2o2b2o4b3o3bo2bo20bo2bo$9bobo11bo20bo 23bo$9bobo7b2o2bo16bo3bo19bo3bo$8b2o3bob2obob3o7b2o9b4o20b4o$7bo3b4obo bo12b2o$8b3o3bo3bob3o7bo$11b4ob2o2bo2bo$8b2obo8bobo12b2o14b2o$7bobo2bo 2b5obo12b2o14bobo$2o5bo3bo3bo4bo3b2o10bo13bo$2o6b3o6b3o5b2o17b2o2b2ob 4o$10bob4obo6bo19bo2bobo4bo$4o7b6o29b2obob2o2b2o$o2bo8b4o25b2o4bobo3b 2o2bo$26b2o12b2o5bobob2o2b2obo$18b2o7bo14bo5bo4bo4bo$6b3o10b2o4bo23b3o bob3o4b2o$4bo3b2o8bo4b4o12bo11b2ob2o6bobo$4bobo2b2o11bo4bo5bo4bobo18b 2obobo$3bo5bo11bob5o5b3o2bobo6b2o10bobobo$4b5o12bo6b2o6bobob2o4b2o13bo $20b2obobobo2bo2b2obobo3bo5bo5bo5b2o$4b5o11bo2bobobob2o2bo4b2ob3o11bo 3b3o$3bo5bo11b2obo2bo6b3o4b3o10b2o3b3o$4bobo2b2o9bo3bob2ob2o2b2obo4b3o 10bo4b3o$4bo3b2o10b2obobo3bo4bobobo2b3o4bo10b3o3bo$6b3o12bobo2b2o2b3ob ob2obo2bo4bobo10b2o2bobo$21bo2bobo8bo4b2o22bo2bo$22b2o2bo3b4obob2obo 20bo$o2bo14b2o6b2o2bo2bobobo2bo20b6obo$4o3b2o10bo14bo3b2o8bo5bo5bo7bo$ 6bo3b9o28b3o3b3o5b3ob3o$2o4bobob7o2b3o24bo2b2ob2o2bo6bobo$2o3b2ob2o2b 4o2bo2bo21b2o13b2o$8bo2bo7b2o21bo6b2ob2o6bo$5b2obobobo29bob2o11b2obo$ 6bo4bo27b2obo5b2o3b2o5bob2o$6bob3o28b2ob2o5bo3bo5b2ob2o$7b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 24 THUMBSIZE 2 ZOOM 6 HEIGHT 450 ]]
A p48 LWSS gun, using Rich's p16 and Eye of Sauron
(click above to open LifeViewer)
RLE: here Plaintext: here

On October 2, 2022, cvojan and vivi discovered[10] a period-24 glider gun with a 21 × 20 bounding box, making it the second smallest known glider gun with a unique period. This was reduced to 20 × 20 by James Pascua the next day.[11]

x = 20, y = 20, rule = B3/S23 bo$b3o13b2o$4bo9b2o2bo$3b2o9b2obo$17b2o$13b3obo$3bo3b2o4b3obo$2bo3b2o 4bo3b2obo$2bo10b2o3b2o$3bo11b2o$4b5o6bo$5b3o9bo$6bo4b2o3b2o$11bobo$13b o$13b2o2$b3o5bo$3o7bo$8b3o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 24 THUMBSIZE 2 ZOOM 16 HEIGHT 400 ]]
20 × 20 period-24 glider gun
(click above to open LifeViewer)
RLE: here Plaintext: here

See also

References

  1. ↑ 1.0 1.1 Paul Callahan (February 11, 2001). "p24 "true" gun (mail digest)". Retrieved on March 17, 2016.
  2. ↑ Jason Summers' jslife pattern collection. Retrieved on March 17, 2016.
  3. ↑ Tanner Jacobi (July 5, 2016). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  4. ↑ Matthias Merzenich (January 13, 2019). Re: Execution of Old Guns by Variable-Speed Firing Squad (discussion thread) at the ConwayLife.com forums
  5. ↑ Matthias Merzenich (November 10, 2019). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
  6. ↑ Matthias Merzenich (November 12, 2019). Re: Execution of Old Guns by Variable-Speed Firing Squad (discussion thread) at the ConwayLife.com forums
  7. ↑ Matthias Merzenich (January 14, 2019). Re: Execution of Old Guns by Variable-Speed Firing Squad (discussion thread) at the ConwayLife.com forums
  8. ↑ BlinkerSpawn (November 10, 2019). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
  9. ↑ Chris Cain (January 15, 2019). Re: Execution of Old Guns by Variable-Speed Firing Squad (discussion thread) at the ConwayLife.com forums
  10. ↑ vivi (October 2, 2022). Re: Gun Discussion Thread (discussion thread) at the ConwayLife.com forums
  11. ↑ James Pascua (October 3, 2022). Re: Execution of Old Guns by Variable-Speed Firing Squad (discussion thread) at the ConwayLife.com forums

External links


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