Period-20 glider gun

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Period-20 glider gun
x = 68, y = 34, rule = B3/S23 2ob2o22b2o$o3bo4b4obo8b2obo2bo5b2o6b2o$b2obob2o4bo7b3obobob2o5bobob2o 3bo$2b3ob2obobobob2o2bo4bobobo8bobo2bo$o11b3ob2o6b2o4bo2b5obob3o$11o6b obo9b5o4b3o$11b2ob2obob2o4bo10b2o3b3o5b2ob2o$2b2o2b4obo3bo2bob4obo2b4o 4bo2bo3bo5b2ob2o3bobo4b2o$2b2o2bo2bo2b2obo3bo6b2o4bo3bobob3o13bob4o2bo $10bobo2bobobo2b6ob3o4bo3bo6b10o5bobo$2b2o4bobo3b2ob2o3bo5b2o4b2o3bo7b o3bo6b5o2b2o$3bo2b4obo11b5o6b2obo11bo3bob2obo4bobo$3bobo5b10o4b2o2bo5b o2bo9b2o2bo3b3o3bobo2bo$b2o2b2o2b2o9bo4b3obo6b3o8bo2b2o3bo3bo2bobob2o$ 2bobo2bobobo2b2o2bo10b2o3b3o10bo2b2o8bo3bo$o2bob3obobobo4b2o14bo9bo2bo 2bo3bo8b2o$2obo4bo5bo4bo18bo4bo3b2o2b2o2bo2bobo2bo$3bo10bo3bo18bo8bobo 4b3o2b2obobobo$3b2o10bob2o2b2o13bo2bo3bo3b2ob3o8bo2b2o$4bo2bobo2bo2b2o bo4bo13bo8bobo4b3o2b2obo$2bobobob2o2b3o2bobo3bo6bo7bo4bo3b2o2b2o2bo2bo bo$2b2o2bo8bo3bo3bo4b2ob2o2bo8bo2bo2bo3bo8b2o$6bob2o2b3o2bobo3bo6bo5bo 10bo2b2o8bo3bo$7bobo2bo2b2obo4bo10b3o10bo2b2o3bo3bo2bobob2o$3b2o10bob 2o2b2o25b2o2bo3b3o3bobo2bo$3bo10bo3bo30bo3bob2obo4bobo$2obo4bo5bo4bo 20bo6bo3bo6b5o2b2o$o2bob3obobobo4b2o8b4o9bo5b10o5bobo$2bobo2bobobo2b2o 2bo8b6o6b3o14bob4o2bo$b2o2b2o2b2o9bo6bo4bo16b2ob2o3bobo4b2o$3bobo5b10o 7bo2bo17b2ob2o$3bo2b4obo14bobo2bobo11bo$2b2o4bobo3b2ob2o7b2o4b2o12bo$ 14b2ob2o25b3o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ ZOOM 6 AUTOSTART OFF ]]
Pattern type Gun
Number of cells 600
Bounding box 68×34
Period 20
Barrels 1
Discovered by Matthias Merzenich
Noam Elkies
Year of discovery 2013

Period-20 glider gun is a true period-20 glider gun that was discovered by Matthias Merzenich in 2013 and improved by Karel Suhajda[1], based on Elkies' true period 24 gun. Further improvements have been made since. This is the shortest-period true-period gun known so far.

Filtering the output of the gun with a blocker yields the smallest known period-40 glider gun, beating the eponymous period-40 glider gun at its own game. The further addition of Rich's p16 doubles the period again, resulting in the smallest known period-80 gun, and adding 68P32.1 on top of that doubles the period once more to 160.

Image gallery

The original form of the gun found in 2013
x = 78, y = 38, rule = B3/S23 46bo12b2ob2o$44b3o12b2ob2o3bobo4b2o$43bo22bob4o2bo$14b2ob2o24b2o12b10o 5bobo$2b2o4bobo3b2ob2o38bo10b2ob2o2b2o$3bo2b4obo28b3o16bo3bob2obobo2bo bo$3bobo5b10o18bo3bo14b2o2bob2o2bob3obo2bo$b2o2b2ob2o10bo19bo17bo4b2o 4b3o2bob2o$2bobo2bobob2obo3bo26bo12b3ob2o10bo$o2bob3obo2b2obo2b2o26bo 8bo2b2o2b2o9b2o$2obo2b3o4b2o4bo20b2o3bo4b2o2bo3bo3bo2bo2bobo2bo$3bo10b 2ob3o20bo8bobob3o2bobo2b3o2b2obobobo$3b2o9b2o2b2o2bo18b3o5bo3b3ob2o2b 2o8bo2b2o$4bo2bobo2bo2bo3bo3bo2b2o21bobob3o2bobo2b3o2b2obo$2bobobob2o 2b3o2bobo2b3obobo21b2o2bo3bo3bo2bo2bobo$2b2o2bo8b2o2b2ob3o3bo5b3o18bo 2b2o2b2o9b2o$6bob2o2b3o2bobo2b3obobo8bo20b3ob2o10bo$7bobo2bo2bo3bo3bo 2b2o4bo3b2o20bo4b2o4b3o2bob2o$3b2o9b2o2b2o2bo8bo26b2o2bob2o2bob3obo2bo $3bo10b2ob3o12bo26bo3bob2obobo2bobo$2obo2b3o4b2o4bo17bo19bo10b2ob2o2b 2o$o2bob3obo2b2obo2b2o7b3o4bo3bo18b10o5bobo$2bobo2bobob2obo3bo4b2o10b 3o28bob4o2bo$b2o2b2ob2o10bo2bo2bob2ob3o25b2ob2o3bobo4b2o$3bobo5b10o4b 2obo2bobo25b2ob2o$3bo2b4obo14bobo2bob2o6bo$2b2o4bobo3b2ob2o7bob2o3b2o 7bo$14b2ob2o8bo2bo9b3o$28b3o$32bo$30b2ob2o11bo$29bobo15bo$29bo2bo2bo9b 3o$30bobo4bo$31b2ob4o$33bo17bo$33bobo16bo$34b2o14b3o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART GPS 10 THUMBSIZE 2 ]]
A different period-20 gun constructed on May 17, 2021
by Matthias Merzenich[2] based on a period-20 oscillator
by wwei23 and David Raucci.[3]
(click above to open LifeViewer)
RLE: here Plaintext: here

References

  1. Matthias Merzenich (May 13, 2013). "p20 gun". Retrieved on March 17, 2015.
  2. Matthias Merzenich (May 17, 2021). Re: Gun Discussion Thread (discussion thread) at the ConwayLife.com forums
  3. wwei23 (May 17, 2021). Re: Gun Discussion Thread (discussion thread) at the ConwayLife.com forums