Period-41 glider gun

Period-41 glider gun
x = 112, y = 106, rule = B3/S23 71bo$71b3o$74bo$73b2o13b2o$88bo$86bobo$86b2o$76bo$75bobo$74bo3bo$74bo 3bo$74bo3bo$55bo19bobo$55b3o18bo$58bo$41bo15b2o14b2o$41b3o19bobo8bo$44b o18b2o6b3o17b2o$43b2o19bo6bo9b3o7bo$56bo23bo3bo4bobo$57b2o20bo5bo3b2o $57b2o10b2o7bo3bo3bo$47b2o20b2o7bo2bobo2bo$46b2obo4bo23bo3bo3bo$47bob 2o2b2o20b2o2bo5bo$48b2o4bo19bobo3bo3bo$74bo6b3o$73b2o$62b2o27bo$34bo27b o27b2o$32b3o5b2o11b2o8b3o24bobo$31bo7bobo11bobo9bo16b2o$16b2o13b2o6bo 8bo6bo26b2o$17bo20b2o9bo5b2o$17bobo27b3o$18b2o$28bo$27bo$29bo$27b3o70b 3o$93b2o5bo9b2o$66b2o26bo6bo8bo$66b2o16bo9bobo11bobo$40bo16bobo24b3o8b 2o11b2o$5b2o24b2o5bobo17b2o27bo$6bo24bo7b2o17bo27b2o$4bo13b2o12b3o40b 2o$2b4o15b2o11bo31b3o6bo$bo14b2obo45bo3bo3bobo19bo4b2o$o2b3o10b2o3bob 2o39bo5bo2b2o20b2o2b2obo$b2o2bo10b2obo3b2o38bo3bo3bo23bo4bob2o$3b2o16b ob2o38bo2bobo2bo7b2o20b2o$3bo14b2o43bo3bo3bo7b2o10b2o$4bo6b3o7b2o26bo 9b2o3bo5bo20b2o$b3o7bo38b2o6bobo4bo3bo23bo$bo5b2o3bo11bo24b2o7bo7b3o9b o6bo19b2o$8bo14bobo31b2o17b3o6b2o18bo$5b3o15b2o50bo8bobo19b3o$5bo69b2o 14b2o15bo$91bo$73bo18b3o$48b2o22bobo19bo$47bobo21bo3bo$22b2o24bo11bo10b o3bo$21b2o38bo9bo3bo$23bo26b2o7b3o10bobo$53b2o18bo$48b2obo$48b2o3bob2o $48b2obo3b2o$53bob2o18b2o$38bo11b2o23bo$38b3o12b2o9bo11b3o$32b2o7bo20b obo13bo$32bobo5b2o21b2o$32bo4$43b3o$43bo$45bo$44bo28bo$53b2o19b2o$53b obo17b2o$55bo$40b2o13b2o$41bo$38b3o$38bo3$84bo$85bo$83b3o9$93bobo$94b 2o$94bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ HEIGHT 440 THUMBSIZE 2 ZOOM 4 Y -6 GPS 15 AUTOSTART LOOP 41 ]]
View static image
Pattern type	Gun
Number of cells	462
Bounding box	112 × 90
Period	41
Barrels	1
Discovered by	iNoMed
Year of discovery	2023
Rules Outer-totalistic rules B3/S23 – B38/S238 # of rules 22 = 4 Isotropic rules B3/S23 – B38/S234c8
Pattern files Plaintext period41glidergun.cells RLE period41glidergun.rle

A period-41 glider gun is a glider gun that emits a period-41 stream. Before 2023, all known period-41 guns in Life were pseudo-period guns.

On July 21, 2023, Nora Brown found two related p41 dependent reflectors (leading to the first known p41 oscillator and a proof that Life is omniperiodic).

On the next day, the first true period 41 glider gun was completed by iNoMed, using a design by Matthias Merzenich based on a partial result by May13 and David Raucci. After several reductions, the bounding box changed from 533 × 553 down to 256 × 267.

Several hours later, iNoMed constructed a much smaller gun using a different design, using a 204P41 and a variant of 246P41. In terms of its 112 × 90 bounding box, it is only slightly larger than the smallest pseudo period 41 glider gun known at the time (bounding box 111 × 90).

Gallery

x = 267, y = 256, rule = B3/S23 246bo$240b2o3bobo$241bo3bo2bo$241bob2obobo$242bobobob2o$237b2o6bo2bo2b o$238bo8bo2b2o$238bobo$239b2o4$240b2o$239bobo$241bo2$263bo$246bo14b3o$ 245bobo12bo$244b2ob2o11b2o$244bo2bo$243b2ob2o$230bo13bobo8b3o3b2o$230b 2o6b2o5bo8b4o5b2o$229bobo6bobo12bobob2o$239bo13b4o7bo$253b2o2b2o3b2o$ 256bo5bo$257b3o2$257b2o$250b2o4bo6b2o$249bobo11bobo$219b3o27bo15bo$ 221bo26b2o15b2o$220bo2$252bo$206b2o15b2o26bo$207bo15bo27b3o$207bobo11b obo$208b2o6bo4b2o$214b2o2$213b3o$210bo5bo$209b2o3b2o2b2o$208bo7b4o13bo $214b2obobo12bobo6bobo$208b2o5b4o8bo5b2o6b2o$210b2o3b3o8bobo13bo$225b 2ob2o$170bo54bo2bo$170b3o38b2o11b2ob2o$173bo38bo12bobo$172b2o13b2o20b 3o14bo$187bo21bo$185bobo$185b2o44bo$175bo55bobo$160b2o12bobo54b2o$160b 2o11bo3bo45bo$173bo3bo44bo$173bo3bo44b3o$174bobo$175bo2$172b2o24b2o$ 162bobo8bo24bo32b2o$162b2o6b3o11b2o14bo30bobo$163bo6bo13bo2b2o10b4o30b o$180b4o3b2obo12bo29b2o$178bob2o3bo3b2o8b2o2bo8bobo4b2o$178b2o3bo3b2ob o8bobob2o7b2o6b2o$178bob2o3b4o4b2o5b2o2bo8bo5bo$180b2o2bo9b2o6b2o$183b 2o8bo6b2o$201bo$152bo27bo15b2o2bo$152bobo24bobo14bo3b2o$152b2o26b2o15b 3o$199bo$202bo6b2o$202bobo3bobo$183b2o17b2o6bo$133bo48bobo$133b3o48bo$ 136bo$119bo15b2o6bo$100bo18b3o19b2o$94b2o3bobo20bo19b2o$95bo3bo2bo18b 2o$95bob2obobo90bo5bo$96bobobob2o29b3o55b2o6b2o$91b2o6bo2bo2bo20bo6bob o11b2o24bo18b2o4bobo$92bo8bo2b2o20bo5b2obo11b2o24b2o$92bobo30bo5bobo5b o32bobo$93b2o31b2o4b3o5bo$126b2o4b5o2bo2$135b2o$94b2o28bo15b2o$93bobo 26bo2bo14bo41bo$95bo22b2o11b2o8b3o37bo6b3o$117bobo2bo8bobo9bo37b3o6bo$ 117bo8bo6bo28b3o24bo$100bo14b3o6bobo6b2o29bo$99bobo12bo10b2o36bo$98b2o b2o11b2o$98bo2bo$97b2ob2o$84bo13bobo8b3o3b2o$84b2o6b2o5bo8b4o5b2o$83bo bo6bobo12bobob2o58bobo4b2o$93bo13b4o7bo52b2o6b2o$107b2o2b2o3b2o17bo16b 2o18bo5bo$110bo5bo19b2o15b2o$111b3o21b2o15bo2$111b2o$104b2o4bo6b2o$ 103bobo11bobo$73b3o27bo15bo$75bo26b2o15b2o40bo6b2o$74bo86bobo3bobo$ 145bo15b2o6bo$106bo37bobo$60b2o15b2o26bo37b2ob2ob2o$61bo15bo27b3o35b2o b2ob2o$61bobo11bobo66bobo$62b2o6bo4b2o68bo$68b2o2$67b3o82bo5bo$64bo5bo 79b2o6b2o$63b2o3b2o2b2o77b2o4bobo$62bo7b4o13bo$68b2obobo12bobo6bobo$ 62b2o5b4o8bo5b2o6b2o38b2o15bo$64b2o3b3o8bobo13bo39b2o15b2o$79b2ob2o51b o16b2o$79bo2bo$65b2o11b2ob2o$66bo12bobo59bo$63b3o14bo59bo6b3o$63bo76b 3o6bo$148bo$85bo$85bobo37b2o36bo$85b2o37bobo37bo$77bo48bo35b3o$76bo$ 76b3o2$86b2o42bobo4b2o$86b2o42b2o6b2o$131bo5bo2$115bo$87bo27b2o55bobo$ 84b2o28bobo56b2o$66bobo4b2o9b2obobo83bo$66b2o6b2o12b2o$67bo5bo14bo14bo $101b3o16bo6b2o$90b3o7bo19bobo3bobo$79bo8bo3bo7b2o18b2o6bo$78bo8bo$78b 3o7bobo4bo$89bo4bobo7b3o77bo$97bo8bo75bobo$56bo6b2o18b2o7bo3bo8bo77b2o $56bobo3bobo19bo7b3o$56b2o6bo16b3o$81bo14bo14bo5bo$95b2o12b2o6b2o$95bo bob2o9b2o4bobo$99b2o$67b2o28bo$66bobo124bo$66bo127b2o$47bo5bo11b2o126b 2o$45b2o6b2o42b2o$46b2o4bobo42b2o$32b2o$33bo72b3o$33bobo72bo$34b2o71bo $98b2o$97bobo104bo$99bo105bo$203b3o$42b3o76bo$44bo59bo14b3o$43bo59bobo 12bo$34b2o66b2ob2o11b2o$33bobo66bo2bo$35bo65b2ob2o$88bo13bobo8b3o3b2o$ 57bo30b2o6b2o5bo8b4o5b2o$40bo14b3o29bobo6bobo12bobob2o96bobo$39bobo12b o42bo13b4o7bo91b2o$38b2ob2o11b2o55b2o2b2o3b2o92bo$38bo2bo72bo5bo$37b2o b2o73b3o$24bo13bobo8b3o3b2o$24b2o6b2o5bo8b4o5b2o56b2o$23bobo6bobo12bob ob2o55b2o4bo6b2o$33bo13b4o7bo48bobo11bobo$47b2o2b2o3b2o19b3o27bo15bo$ 50bo5bo22bo26b2o15b2o100bo$51b3o24bo144bobo$224b2o$51b2o57bo$44b2o4bo 6b2o5b2o15b2o26bo$43bobo11bobo5bo15bo27b3o$13b3o27bo15bo5bobo11bobo$ 15bo26b2o15b2o5b2o6bo4b2o$14bo57b2o2$46bo24b3o160bo$2o15b2o26bo22bo5bo 160b2o$bo15bo27b3o19b2o3b2o2b2o156b2o$bobo11bobo48bo7b4o13bo$2b2o6bo4b 2o55b2obobo12bobo6bobo$8b2o56b2o5b4o8bo5b2o6b2o$68b2o3b3o8bobo13bo$7b 3o73b2ob2o$4bo5bo72bo2bo$3b2o3b2o2b2o55b2o11b2ob2o$2bo7b4o13bo42bo12bo bo159bo$8b2obobo12bobo6bobo29b3o14bo161bo$2b2o5b4o8bo5b2o6b2o30bo176b 3o$4b2o3b3o8bobo13bo$19b2ob2o65bo$19bo2bo66bobo$5b2o11b2ob2o66b2o$6bo 12bobo$3b3o14bo$3bo$90b2o$25bo64bobo161bobo$25bobo51b2o2bo8bo162b2o$ 25b2o52bo2bo2bo6b2o161bo$81b2obobobo$82bobob2obo$82bo2bo3bo$26b2o55bob o3b2o$26bobo55bo$15b2o2bo8bo$15bo2bo2bo6b2o$17b2obobobo241bo$18bobob2o bo238bobo$18bo2bo3bo239b2o$19bobo3b2o$20bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ ZOOM 2 THUMBSIZE 2 WIDTH 600 HEIGHT 540 ]]

A reduced form of the original p41 gun design by iNoMed, based on partial results by Matthias Merzenich, May13, and David Raucci (click above to open LifeViewer) RLE: here Plaintext: here

External links

• guntrue_41 at Adam P. Goucher's Catagolue (the smallest known true period 41 glider gun)
• gun_41 at Adam P. Goucher's Catagolue (the smallest known period 41 glider gun)