28P7.2

28P7.2
x = 12, y = 11, rule = B3/S23 b2o9b$2bo9b$bo10b$b2o7b2o$3bo4bo2bo$b2o2b2o2b2ob$o2bo4bo3b$2o7b2ob$10b ob$9bo2b$9b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 2 LOOP 7 THUMBSIZE 2 ZOOM 20 ]]
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Pattern type	Oscillator
Number of cells	28
Bounding box	12 × 11
Period	7
Mod	7
Heat	5.1
Volatility	0.42
Strict volatility	0.42
Discovered by	Dean Hickerson
Year of discovery	1998
Rules Outer-totalistic rules B3/S23 – B378/S23678 # of rules 25 = 32 Isotropic rules B3aceiy/S2-in3-ak – B2n34ceqtwz5aek6-k78/S234-jn5-ky678
Glider synthesis Fewest gliders 16† Catagolue-generated RLE synthesis Uploaded synthesis RLE 28p7.2_synth.rle †Can be constructed with 15 gliders using the reverse caber tosser universal constructor.
Pattern files Plaintext 28p7.2.cells RLE 28p7.2.rle
Identifiers apgcode xp7_o8y2gbdz0dl31w11156z011 Pentadecathlon ID 28P7.2

28P7.2 is an unnamed period-7 oscillator discovered by Dean Hickerson in 1998. In terms of its 28 cells, it is tied with oscillators burloaferimeter, 28P7.1, and 28P7.3 as the smallest known period 7 oscillator. In September, 2000 Mark Niemiec and Jason Summers found a 22-glider synthesis of this oscillator.

A stator variant of this oscillator appeared semi-naturally on October 28, 2018, in a symmetric soup submitted to Catagolue by carybe, and the canonical variant first appeared on August 12, 2022, in a symmetric soup by the Open Science Grid.

See also

• 37P10.1
• Eater bridge eater, the catalyst this oscillator is based on

External links

• 28P7.2 at Adam P. Goucher's Catagolue

• 28P7.2 at Heinrich Koenig's Game of Life Object Catalogs
• All semi-natural stator variants of 28P7.2 (Catagolue)