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x = 13, y = 9, rule = B3/S23 2b2o9b$2bo10b$7bo5b$6obo5b$o12b$b2ob2o3b2o2b$2bobo4bobob$2bobo6bob$3bo 7b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 2 LOOP 7 THUMBSIZE 2 ]]
Pattern type Oscillator
Number of cells 28
Bounding box 13×9
Period 7
Mod 7
Heat 4.9
Volatility 0.40
Strict volatility 0.40
Discovered by Dean Hickerson
Year of discovery 1998

28P7.1 is an unnamed period-7 oscillator discovered by Dean Hickerson on November 1, 1998.[1] In terms of its 28 cells, it is tied with oscillators burloaferimeter, 28P7.2, and 28P7.3 as the smallest known period 7 oscillator.[2]

Using a sufficiently accessible dot spark, this oscillator can be phase shifted one generation backwards. The period of the resulting oscillator is the smallest number of the form 7n+1 which is also a multiple of the spark period.

x = 81, y = 52, rule = B3/S23 10bo$9bob2o$2b2o9bo33b2o7bo2bo4bo2bo$2bo6bo2bobo32bo6b3o2b6o2b3o$7bo3b o2bo37bo3bo2bo4bo2bo$6obo4b2o31b6obo$o44bo$b2ob2o3b2o35b2ob2o3b2o$2bob o4bobo35bobo4bobo$2bobo6bo35bobo6bo$3bo7b2o35bo7b2o11$61bo7bo$60bobo5b obo$61bo7bo4$54bobo17bobo$57bo15bo$56bo4bo7bo4bo$52bo7bo2bo3bo2bo7bo$ 51bob2o6b3o3b3o6b2obo$51bo9b3o3b3o9bo$24bobo2b2o19b2o27b2o$9b2o12bo3bo b3o4b2o$9b2o13bo6b2o3b2o19b2o13b2o$25b5obo25b2o13b2o$28b3o$9bobo3bobo 32b2o27b2o$11bo3bo12b3o20bo9b3o3b3o9bo$7bo11bo5b5obo19bob2o6b3o3b3o6b 2obo$6bo3bo5bo3bo3bo6b2o3b2o14bo7bo2bo3bo2bo7bo$7bo11bo3bo3bob3o4b2o 18bo4bo7bo4bo$2b2o7bo3bo8bobo2b2o16b2o8bo15bo$2bo6bobo3bobo29bo6bobo 17bobo$7bo44bo$6obo37b6obo$o44bo$b2ob2o3b2o35b2ob2o3b2o5bo7bo$2bobo4bo bo35bobo4bobo3bobo5bobo$2bobo6bo35bobo6bo4bo7bo$3bo7b2o35bo7b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
Top: p8 using mold, p15 using pentadecathlon
Bottom: p92 using twin bees shuttle, p141 using p47 pre-pulsar shuttle
(click above to open LifeViewer)
RLE: here Plaintext: here


  1. Jason Summers' jslife pattern collection. Retrieved on October 28, 2020.
  2. "Class 2 Objects Catalog". Retrieved on March 14, 2009.

External links

  • 28P7.1 at Heinrich Koenig's Game of Life Object Catalogs