117P18: Difference between revisions

	117P18
	<span class="mw-default-size" typeof="mw:File"><a href="/wiki/File:117p18.png" class="mw-file-description" title="117P18 image"><img alt="117P18 image" src="/w/images/d/d1/117p18.png" decoding="async" width="173" height="137" class="mw-file-element"></a></span>
	<span class="mw-default-size" typeof="mw:File"><a href="/wiki/File:117p18.png" class="mw-file-description" title="117P18 image"><img alt="117P18 image" src="/w/images/d/d1/117p18.png" decoding="async" width="173" height="137" class="mw-file-element"></a></span>
	View animated image
	View static image
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
Rules
Outer-totalistic rules	B3/S23 only
# of rules	20 = 1
Isotropic rules	B3-cky/S23-c – B34cikqtyz5cjn6cen7c/S234cektyz5cek6ein
Pattern files
Plaintext	117p18.cells
RLE	117p18.rle
Identifiers
apgcode	xp18_32acxca23zy06e6y7oggy1ggozy0cecy1ggy223ggg32zy1cscy01hoky21j1zy1osoy4ooy0333z0ggkcxckggy7373z01y51y7676zyfc453x354c
Pentadecathlon ID	117P18.1

← Older edit

Latest revision as of 14:51, 16 January 2026

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 = 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 ]]

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

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

External links

117P18 at Adam P. Goucher's Catagolue
117P18.1 at Heinrich Koenig's Game of Life Object Catalogs

[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.

[2] Dean Hickerson's oscillator stamp collection. Retrieved on April 11, 2009.

[note 1]

[1]

@@ Line 14: / Line 14: @@
 |rulemin          = B3/S23
 |rulemax          = B3/S23
-|rulespecial      = [[Conway's Game of Life|Conway Life]]
 |isorulemin       = B3-cky/S23-c
 |isorulemax       = B34cikqtyz5cjn6cen7c/S234cektyz5cek6ein