Karel's p28

Karel's p28
x = 36, y = 36, rule = B3/S23 10b2o12b2o$10b2o12b2o5$12b2o8b2o$11bo2bo6bo2bo$11bo12bo$11bo12bo$2o10b o10bo10b2o$2o5b3o16b3o5b2o$6bo3bo14bo3bo$6bo22bo$7bo20bo7$7bo20bo$6bo 22bo$6bo3bo14bo3bo$2o5b3o16b3o5b2o$2o10bo10bo10b2o$11bo12bo$11bo12bo$ 11bo2bo6bo2bo$12b2o8b2o5$10b2o12b2o$10b2o12b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ THUMBSIZE 3 GPS 12 ZOOM 15 HEIGHT 600 LOOP 28 ]]
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Pattern type	Oscillator
Number of cells	88
Bounding box	36 × 36
Period	28
Mod	28
Heat	106.3
Volatility	0.97
Strict volatility	0.97
Discovered by	Karel Suhajda
Year of discovery	2007
Rules Outer-totalistic rules B3/S23 – B378/S238 # of rules 23 = 8 Isotropic rules B3/S23 – B34c5k6ei78/S234c6ik7e8
Glider synthesis Fewest gliders 46† Catagolue-generated RLE synthesis Uploaded synthesis RLE 88p28_synth.rle †Can be constructed with 15 gliders using the reverse caber tosser universal constructor.
Pattern files Plaintext 88p28.cells RLE 88p28.rle
Identifiers apgcode xp28_y633y833zy68sq6y46qs8z33y0ca76yc67acy033zzggy0ckooycookcy0ggz11y2104emoy4ome401y211zy6ggy8ggzy611y811 Pentadecathlon ID 88P28.1

Karel's p28 is a period-28 oscillator discovered by Karel Suhajda on June 12, 2007. Other than sharing blocks, two of these oscillators can interact at two ships (see #Gallery).

The first known semi-natural appearance of this oscillator was in December 2014, in a symmetric soup found by Dongook Lee using apgsearch. About 1 in 55 million eightfold symmetric soups with even symmetry (D8_4) form a Karel's p28. A period-56 LCM consisting of a Karel's p28 interacting with four figure eights has occurred seminaturally; this is the only p56 oscillator to appear from soup so far.

A 46-glider synthesis of this oscillator was found by Jeremy Tan on January 5, 2020.

Gallery

x = 61, y = 61, rule = B3/S23 10b2o12b2o$10b2o12b2o5$12b2o8b2o$11bo2bo6bo2bo$11bo12bo$11bo12bo$2o10b o10bo10b2o$2o5b3o16b3o5b2o$6bo3bo14bo3bo$6bo22bo$7bo20bo7$7bo20bo$6bo 22bo$6bo3bo14bo3bo$2o5b3o16b3o5b2o$2o10bo10bo10bobo12b2o$11bo12bo10b2o 12b2o$11bo12bo$11bo2bo6bo2bo$12b2o8b2o2$37b2o8b2o$36bo2bo6bo2bo$36bo 12bo$10b2o12b2o10bo12bo$10b2o12bobo10bo10bo10b2o$25b2o5b3o16b3o5b2o$ 31bo3bo14bo3bo$31bo22bo$32bo20bo7$32bo20bo$31bo22bo$31bo3bo14bo3bo$25b 2o5b3o16b3o5b2o$25b2o10bo10bo10b2o$36bo12bo$36bo12bo$36bo2bo6bo2bo$37b 2o8b2o5$35b2o12b2o$35b2o12b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ZOOM 8 WIDTH 500 HEIGHT 500 GPS 7 AUTOSTART ]]

Two copies of this oscillator interacting at two ships (click above to open LifeViewer) RLE: here Plaintext: here

See also

• p28 pre-pulsar shuttle

External links

• Karel's p28 at Adam P. Goucher's Catagolue
• Figure eight on Karel's p28 (p56 LCM) at Adam P. Goucher's Catagolue
• 88P28.1 at Heinrich Koenig's Game of Life Object Catalogs