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 | 0.10
Kinetic symmetry
n.e
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 .
Gallery
x = 19, y = 32, rule = B3/S23
6bo$5bobo2b2o$5bobo3bo$3b2obob3o$2bobo3bo$bo2bobo$2b4obo$7bo2b2o$2b2o
bobo2b2o$o2bob2o$2obo$3bo$3b2o$13b2o$9b2o2b2o$8b2o$9bo$4b2o$4b2o$14b2o
$15bo$15bob2o$12b2obo2bo$7b2o2bobob2o$7b2o2bo$11bob4o$12bobo2bo$10bo3b
obo$8b3obob2o$7bo3bobo$7b2o2bobo$12bo!
#C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]]
#C [[ AUTOSTART GPS 5 THUMBLAUNCH THUMBSIZE 2 THEME 6 ZOOM 12 HEIGHT 480 WIDTH 480 ]]
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The similar 99P18(click above to open LifeViewer ) RLE :here Plaintext :here Catagolue here
Notes
↑ 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
External links
