117P18

From LifeWiki
Jump to navigation Jump to search
117P18
x = 39, y = 30, rule = b3/s23 37b2o$8b2o27bob$9bo25bobob$9bobo23b2o2b$10b2o13bobo2bobo6b$14bobo2bobo 2bo2bo2bo2bo5b$13bo2bo2bo2bo2bobo2bobo6b$14bobo2bobo13b2o2b$10b2o23bob ob$9bobo25bob$9bo27b2o$8b2o29b$23b2o14b$19b2o2b2o14b$18b2o19b$19bo19b$ 14b2o23b$14b2o23b$29b2o8b$2o27bo9b$bo25bobo9b$bobo23b2o10b$2b2o13bobo 2bobo14b$6bobo2bobo2bo2bo2bo2bo13b$5bo2bo2bo2bo2bobo2bobo14b$6bobo2bob o13b2o10b$2b2o23bobo9b$bobo25bo9b$bo27b2o8b$2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ THUMBSIZE 2 GPS 9 ZOOM 10 ]]
Pattern type Oscillator
Number of cells 117
Bounding box 39×30
Period 18
Mod 9
Heat 102.9
Volatility 0.86
Strict volatility 0.10
Discovered by David Buckingham
Year of discovery Unknown

117P18 is an unnamed period-18 oscillator. It was the first period 18 oscillator to be found,[note 1] and was discovered by David Buckingham no later than May, 1991.[1]

It consists of two extended snackers and two blocks used to hassle an R-pentomino.

Gallery

x = 21, y = 28, rule = B3/S23 3bob2o4b2obo$3b2o2bo2bo2b2o$b2o3bo4bo3b2o$o3b2ob4ob2o3bo$b3obobo2bobob 3o$3bobobo2bobobo$6bo4bo$7bo2bo$7bo2bo3$14b2o$10b2o2b2o$9b2o$10bo$5b2o $5b2o3$10bo2bo$10bo2bo$9bo4bo$6bobobo2bobobo$4b3obobo2bobob3o$3bo3b2ob 4ob2o3bo$4b2o3bo4bo3b2o$6b2o2bo2bo2b2o$6bob2o4b2obo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART GPS 9 THUMBLAUNCH THUMBSIZE 2 THEME 6 ZOOM 12 HEIGHT 480 WIDTH 480 ]]
The similar 113P18
(click above to open LifeViewer)
RLE: here Plaintext: here

Notes

  1. A nontrivial period-18 oscillator, such as unix on snacker, could have been constructed from two oscillators of lower period (such as p6 and p9), both of which were known by an earlier date. However, no such LCM oscillators were attested prior to the discovery of this oscillator in 1991.

References

  1. Dean Hickerson's oscillator stamp collection. Retrieved on April 11, 2009.

External links

  • 117P18.1 at Heinrich Koenig's Game of Life Object Catalogs