Period-45 glider gun

Period-45 glider gun
x = 48, y = 40, rule = B3/S23 15bo2bo2bo$15b7o2$15b7o$15bo2bo2bo6$16bo2bo$12b2o2bo2bo$12b2o2bo2bo7b 2o$27b2o4b2o3bo2bo3b2o$33b5o4b5o$33b2o3bo2bo3b2o$27b3o2$2ob2o$bobo23b 3o$bobo6b3o$2ob2o29bobo$bobo31b2o$bobo6b3o22bo$2ob2o2$11b2o$11b2o7bo2b o2b2o$20bo2bo2b2o$20bo2bo3$47bo$45bobo$46b2o$18bo2bo2bo$18b7o2$18b7o$ 18bo2bo2bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ ZOOM 6 GPS 12 ]]
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Pattern type	Gun
Number of cells	147
Bounding box	47 × 38
Period	45
Barrels	4
Discovered by	Matthias Merzenich
Year of discovery	2010
Rules Outer-totalistic rules B3/S23 only # of rules 20 = 1 Isotropic rules B3/S23 – B3/S234c6ein
Glider synthesis Fewest gliders 40† Uploaded synthesis RLE period45glidergun_synth.rle †Can be constructed with 15 gliders using the reverse caber tosser universal constructor.
Pattern files Plaintext period45glidergun.cells RLE period45glidergun.rle

Period-45 glider gun is a true period 45 glider gun discovered by Matthias Merzenich on April 29, 2010. Its core is part of an agar with 90° rotational symmetry that produces pi-heptominoes. One of the hassling pentadecathlons extracts the output glider with its V spark, and the remaining three (in the original statorless one-barrelled version below) suppress the pi-heptominoes with their domino spark.

Soon after its discovery, Adam P. Goucher and Dave Greene reduced the bounding box with another pi-suppressing mechanism at the cost of higher population. In the infobox is a further improvement by Tanner Jacobi in 2015 with stable pi eaters found by Bellman.

Glider syntheses for the one-barrelled and four-barrelled versions of the original gun (costing 46 and 40 gliders respectively) were posted by Jeremy Tan on January 5, 2020, in response to a less efficient synthesis by Entity Valkyrie using a different method.

x = 56, y = 54, rule = B3/S23 26bo$26bo$25bobo$26bo$26bo$26bo$26bo$25bobo$26bo$26bo9$19b2ob6o$19b2o 13b2o$34b2o4bo2b2o4b2o2bo$39bo3b3o2b3o3bo$35bo4bo2b2o4b2o2bo$35bo$35bo $35bo$2bo4bo10bo16bo$2ob4ob2o8bo16bo$2bo4bo10bo24bo$18bo22bobo$18bo23b 2o$18bo2$18b2o$18b2o13b2o$26b6ob2o4$53bo$54b2o$53b2o3$27bo$27bo$26bobo $27bo$27bo$27bo$27bo$26bobo$27bo$27bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 AUTOSTART GPS 12 ZOOM 8 HEIGHT 480 WIDTH 600 ]]

Original and statorless period-45 glider gun (click above to open LifeViewer) RLE: here Plaintext: here

In August 2022, the discovery of p45 pi-heptomino hassler led to a smaller period-45 glider gun, which was also the smallest known gun with an odd period until appearance of period-25 glider gun.

x = 33, y = 23, rule = B3/S23 24bo$23b3o3$23b3o2$5bo2bo4bo2bo6bobo$3b3o2b6o2b3o4bobo$5bo2bo4bo2bo$23b3o2$2o$obo20b3o$bo22bo5b2o$7b2o3b2o15bo2bo$6bobo3bobo13bobobo$5b2obo3bob2o10b3o2bo$6b2o5b2o$7bo5bo14b2o$29bo$25bo$9b2o15bo$9b2o13b3o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 AUTOSTART GPS 12 ZOOM 8 HEIGHT 480 WIDTH 600 ]]

The current smallest period-45 glider gun (click above to open LifeViewer)

See also

• Period-88 glider gun, another statorless gun like maximum volatility gun

External links

• Period-45 glider gun at the Life Lexicon