Tapeworm

Tapeworm
x = 7, y = 5, rule = B3/S23 ob2o$2obo$3bob2o$3bo2bo$4b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 3 ZOOM 21 HEIGHT 400 SUPPRESS ]] [[ ZOOM 48 ]]
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Pattern type	Strict still life
Number of cells	13
Bounding box	7 × 5
Frequency class	22.3
Static symmetry	n (C1)
Discovered by	Unknown
Year of discovery	Unknown
Rules Outer-totalistic rules B/S23 – B3678/S012345678 # of rules 211 = 2048 Isotropic rules B/S2-cn3nr – B2ikn34-nrt5-knq678/S012345678
Glider synthesis Fewest gliders 4 Catagolue-generated RLE synthesis
Pattern files Plaintext tapeworm.cells RLE tapeworm.rle
Identifiers apgcode xs13_321fgkc Niemiec ID 13.198 Pentadecathlon ID 13.160

Tapeworm (or snake with curl) is a 13-cell still life. Despite being particularly common, this still life did not have a name until 2019, when the two aforementioned names were mentioned in its Catagolue comment section.

Construction

Tapeworm is known to be constructible with 4 gliders. Several known syntheses can be found in Mark Niemiec's database. A 4-glider synthesis was found in August 2017.

x = 40, y = 17, rule = B3/S23 2bo$obo$b2o3$29bo$28bo$28b3o6$37bobo$26b3o8b2o$26bo11bo$27bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 470 THEME Book ZOOM 12 Y 5 AUTOSTART GPS 14 T 0 PAUSE 1 LOOP 113 ]] A 4G synthesis (click above to open LifeViewer)

x = 26, y = 25, rule = B3/S23 bo$2bo$3o20bobo$23b2o$24bo3$19bo$18bo$18b3o6$23b3o$23bo$24bo5$20bo$19b 2o$19bobo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 400 THEME Book ZOOM 14 AUTOSTART GPS 12 T 0 PAUSE 1 LOOP 64 ]] A 5G synthesis (click above to open LifeViewer)

Occurrence

See also: List of common still lifes

It is the 102nd most common still life on Adam P. Goucher's Catagolue, being less common than cis-boat with nine but more common than loaf back tie loaf. It is the 6th most common still life with 14 cells, being less common than cis-boat on cap but more common than boat with hooked nine.

The octo3obj database contains four collisions with tapeworm in the ash.

See also

• Worm

External links

• Tapeworm at Adam P. Goucher's Catagolue
• 13.160 at Heinrich Koenig's Game of Life Object Catalogs
• The 240 thirteen-bit still-lifes at Mark D. Niemiec's Life Page (download pattern file: 13/13-198.rle)
• Tapeworm at Wikipedia (name origin)