Period-156 glider gun

Period-156 glider gun
x = 42, y = 42, rule = B3/S23 20b2o$20b2o$6b2o$5b2o$7bo$3bo$2b2o18b2o$2bobo17bo$22bo$23bo9$32bo2bo$ 33b3o$2o38b2o$2o38b2o$6b3o$6bo2bo9$18bo$19bo$19bo17bobo$18b2o18b2o$38b o$34bo$35b2o$34b2o$20b2o$20b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ THUMBSIZE 2 HEIGHT 480 LOOP 156 ]]
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Pattern type	Gun
Number of cells	36
Bounding box	42×42
Period	156
Barrels	8
Discovered by	Jason Summers
Year of discovery	2004
Rules Outer-totalistic rules B3/S23 – B3/S238 Important rules Conway Life # of rules 21 = 2 Isotropic rules B3/S23 – B3/S234c8
Glider synthesis Fewest gliders 14 Catagolue-generated RLE p156gun_synth.rle Uploaded synthesis RLE p156gun_synth.rle
Pattern files Plaintext p156gun.cells RLE p156gun.rle
Identifiers apgcode yl78_1_20_ce2bb2c697ad330277935c32ef179035

Period-156 glider gun is a glider gun with 8 barrels that was found by Jason Summers on October 28, 2004. The oscillator Jason's p156 is basically this gun with all glider streams blocked. In terms of its 36 cells it is the same size as the Gosper glider gun, but the Simkin glider gun is still smaller at 29 cells. It is capable of pulling beacons.

The gun first appeared semi-naturally in January 2015 in a soup found by Dongook Lee using apgsearch, making it the first semi-natural gun. A 16-glider synthesis was discovered for this gun by Goldtiger997 on June 2, 2019, which was improved to 14 gliders the next day by Oscar Cunningham.

x = 74, y = 80, rule = B3/S23 66bobo$66b2o$67bo14$39bo11bobo$39bobo9b2o$39b2o11bo3$54b3o$54bo$55bo7$ 51bo$49b2o$50b2o4$23bo$24bo$22b3o46b3o$bo69bo$2bo69bo$3o46b3o$49bo$50b o4$22b2o$23b2o$22bo7$18bo$19bo$17b3o3$21bo11b2o$21b2o9bobo$20bobo11bo 14$6bo$6b2o$5bobo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ]]

14-glider synthesis of period-156 glider gun (click above to open LifeViewer) RLE: here Plaintext: here

A suppressed form of the gun appeared semi-naturally on September 22, 2018, in a soup submitted by carybe, forming a period-312 oscillator, the highest-period oscillator to have occurred semi-naturally.

External links

• Period-156 glider gun at Adam P. Goucher's Catagolue (linear growth)