Centinal

Centinal
x = 52, y = 17, rule = B3/S23 2o48b2o$bo48bo$bobo21b2o21bobo$2b2o8bo12b2o12b2o7b2o$11b2o26bobo$10b2o 29bo$11b2o2b2o22b3o4$11b2o2b2o22b3o$10b2o29bo$11b2o26bobo$2b2o8bo12b2o 12b2o7b2o$bobo21b2o21bobo$bo48bo$2o48b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 10 ZOOM 10 ]]
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Pattern type	Oscillator
Oscillator type	Shuttle
Number of cells	70
Bounding box	52 × 17
Period	100 (mod: 100)
Heat	52
Volatility	0.95 | 0.95
Kinetic symmetry	-c
Discovered by	Bill Gosper
Year of discovery	Unknown
Rules Outer-totalistic rules B3/S23 – B3/S238 # of rules 21 = 2 Isotropic rules B3/S23-c – B34e6cn/S234ce5ek6n7e8
Glider synthesis Fewest gliders 16† Catagolue-generated RLE synthesis Uploaded synthesis RLE centinal_synth.rle †Can be constructed with 15 gliders using the reverse caber tosser universal constructor.
Pattern files Plaintext centinal.cells RLE centinal.rle
Identifiers apgcode xp100_178cyao8gy0ccy0g8oyac871zye1m31y5322z0g8oyae972xooy079dyao8gz23yzy532 Pentadecathlon ID 70P100.1

Centinal is a period-100 shuttle oscillator that was found by Bill Gosper no earlier than 1973 and no later than 1987, being the first oscillator of this period to be discovered. It combines the mechanisms of the period 46 and period 54 shuttles. Its duoplet spark is able to reflect gliders by 90 degrees, a property that Gosper used circa 1984 to construct a p1100 MWSS gun.

Gallery

x = 52, y = 22, rule = b3/s23 25bo26b$23b2o27b$24b2o26b3$2o48b2o$bo48bob$bobo36bo7bobob$2b2o7b2o5b2o 13bo5bo2bo5b2o2b$18bobo11b2o5bo12b$12b2o6bo10b2o10bo8b$8bobo2bo4b3o11b 2o4b2o3bo8b$9b3obo24b5o9b2$9b3obo24b5o9b$8bobo2bo4b3o11b2o4b2o3bo8b$ 12b2o6bo10b2o10bo8b$18bobo11b2o5bo12b$2b2o7b2o5b2o13bo5bo2bo5b2o2b$bob o36bo7bobob$bo48bob$2o48b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 GPS 10 AUTOSTART LOOP 70 PAUSE 1 ]]

Centinal reflecting a glider (click above to open LifeViewer) RLE: here Plaintext: here

x = 52, y = 23, rule = B3/S23 22bo4bo$20b2ob4ob2o$22bo4bo4$2o48b2o$bo48bo$bobo44bobo$2b2o32bo11b2o$ 14bo22bo$13b3o3b2o10b2o5bo$14b2o3b2o10b2o2bobo$15bo20bo2$15bo20bo$14b 2o3b2o10b2o2bobo$13b3o3b2o10b2o5bo$14bo22bo$2b2o32bo11b2o$bobo44bobo$b o48bo$2o48b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 50 THUMBSIZE 2 ZOOM 8 ]] Pentadecathlon on centinal. Though the p60+120n glider shuttle is older, this oscillator was previously considered to be the smallest p300 oscillator. (click above to open LifeViewer) RLE: here Plaintext: here Catagolue: here

See also

• p54 shuttle
• Twin bees shuttle

External links

• Centinal at the Life Lexicon
• Centinal at Adam P. Goucher's Catagolue (extended)
• 70P100.1 at Heinrich Koenig's Game of Life Object Catalogs