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!
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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] David Buckingham no later than May, 1991 .[1]
It consists of two extended snackers and two blocks used to hassle an R-pentomino .
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!
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Notes
↑ A period-18 oscillator, unix on snacker , can be constructed from two sparkers (unix and snacker ) both of which were definitely known by 1976 . However, this type of oscillator is generally considered "boring", and thus not counted despite technically being non-trivial .
References External links 117P18.1 at Heinrich Koenig's Game of Life Object Catalogs 
