Long⁷ snake

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Long7 snake
x = 11, y = 9, rule = B3/S23 9b2o$8bobo$7bo$6bo$5bo$4bo$3bo$obo$2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 3 ZOOM 21 HEIGHT 400 SUPPRESS ]] #C [[ HEIGHT 500 THUMBSIZE 3 ZOOM 36 ]]
Pattern type Strict still life
Number of cells 13
Bounding box 9 × 11
Frequency class 41.2
Static symmetry .c (C2_1)
Discovered by Unknown
Year of discovery Unknown

Long7 snake is a 13-cell still life, an extension of snake.

Construction

For several years this still life has had a known glider synthesis with 8 gliders.[1]

x = 43, y = 31, rule = B3/S23 25bo$24bo$24b3o$6bo$7bo$5b3o$25bo$25bobo$25b2o5$32b2o$32bobo$35bo$36bo $37bo$38bo$bo37bo$b2o30bo6bobo$obo23b3o3b2o7b2o$26bo5bobo$18b2o7bo$18b obo$18bo3$30b2o$30bobo$30bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 500 THEME Book ZOOM 10 AUTOSTART GPS 12 T 0 PAUSE 1 T 20 PAUSE 3 T 30 PAUSE 1 T 37 PAUSE 2 LOOP 38 ]]
An 8G synthesis
(click above to open LifeViewer)

A glider synthesis with 6 gliders is now known.[2]

x = 34, y = 18, rule = B3/S23 2bo$3bo$b3o9bo$11b2o10b2o$5bobo4b2o9bobo$5b2o19bo$6bo20bo$28bo$29bo$4b 2o24bo$3b2o26bobo$5bo7b3o16b2o$13bo$14bo2$3o$2bo$bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 500 THEME Book ZOOM 16 AUTOSTART GPS 10 T 0 PAUSE 2 LOOP 50 ]]
A 6G synthesis
(click above to open LifeViewer)

Occurrence

See also: List of common still lifes, List of still lifes with 13 cells

Among the 240 still lifes with 13 cells, this is the third-rarest of them all according to Catagolue.[3]

References

  1. Life Thirteen-Bit Still-Lifes at Mark D. Niemiec's Life Page (download pattern file: 13/13-42.rle)
  2. web.archive.org (Catagolue page for Long7 snake as of April 1, 2024)
  3. catagolue.hatsya.com (last page of Catagolue list showing 13-bit still lifes ordered by commonness)

External links