29P9

29P9
#O Dean Hickerson, April 1997 #C The smallest known period 9 oscillator x = 10, y = 10, rule = B3/S23 b2o7b$2bo7b$2bob2o4b$b2obobo3b$7bo2b$5b3o2b$2o6b2o$o2bob2obob$2b2obo2b ob$6b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 3 LOOP 9 THUMBSIZE 2 ZOOM 20 ]]
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Pattern type	Oscillator
Oscillator type	Billiard table
Number of cells	29
Bounding box	10 × 10
Period	9 (mod: 9)
Heat	3.3
Volatility	0.27 | 0.27
Kinetic symmetry	n
Discovered by	Dean Hickerson
Year of discovery	1997
Rules Outer-totalistic rules B3/S23 – B38/S023678 # of rules 25 = 32 Isotropic rules B3-ae/S2-i3-ay – B2in34cej5ai6akn7c8/S01c234acenqrw5-y678
Glider synthesis Fewest gliders 53† Catagolue-generated RLE synthesis Uploaded synthesis RLE 29p9_synth.rle †Can be constructed with 15 gliders using the reverse caber tosser universal constructor.
Pattern files Plaintext 29p9.cells RLE 29p9.rle
Identifiers apgcode xp9_0c93wmk46z69bo7421 Pentadecathlon ID 29P9.1

29P9 is an unnamed period-9 billiard table oscillator discovered by Dean Hickerson in April 1997. In terms of its 29 cells, it is the smallest known period 9 oscillator.

Martin Grant found a 59-glider synthesis of 29P9 on August 6, 2016. Chris857 lowered the cost to 53 gliders on May 7, 2025.

In one of its phases, it contains a recognizable subset of cells shaped like the long ship, although connected to the rest of the pattern.

External links

• 29P9 at Adam P. Goucher's Catagolue
• 29P9.1 at Heinrich Koenig's Game of Life Object Catalogs