Pentadecathlon on snacker

Pentadecathlon on snacker
x = 20, y = 17, rule = B3/S23 6bo4bo$4b2ob4ob2o$6bo4bo4$2o16b2o$bo16bo$bobo12bobo$2b2o12b2o$7bo4bo$ 5b2ob4ob2o$7bo4bo$2b2o12b2o$bobo12bobo$bo16bo$2o16b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 9 ZOOM 12 LOOP 45 ]]
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Pattern type	Oscillator
Number of cells	52
Bounding box	20 × 20
Period	45 (mod: 45)
Heat	48.7
Volatility	0.87 | 0.01
Kinetic symmetry	Unspecified
Discovered by	Unknown
Year of discovery	Unknown
Rules Outer-totalistic rules B3/S23 only # of rules 20 = 1 Isotropic rules B3-cky/S23-cjkq – B34ckqrty5-aeiq6-ik7c/S234ckqyz5-aiqy6-c
Glider synthesis Fewest gliders 23† Catagolue-generated RLE synthesis Uploaded synthesis RLE pentadecathlononsnacker_synth.rle †Can be constructed with 15 gliders using the reverse caber tosser universal constructor.
Pattern files Plaintext pentadecathlononsnacker.cells RLE pentadecathlononsnacker.rle
Identifiers apgcode xp45_32acxca23zy06e6y3skszy0cecy3vnvzo8a6x6a8o

Pentadecathlon on snacker is a period-45 oscillator composed of a pentadecathlon and a snacker. Although it is composed of two oscillators of smaller periods (15 and 9 respectively), it is considered to be non-trivial, because it has two cells that oscillate at the full period. It was the first non-trivial period 45 oscillator to be discovered and was discovered sometime before August 1995. In terms of its 52 cells, it is the second smallest known non-trivial period 45 oscillator, after pentadecathlon on thumb 1 with 48 cells.

On March 4, 2022, a variant of this oscillator appeared in a D4_+2-symmetric soup found using Charity Engine, making it the first p45 oscillator to appear semi-naturally.

Gallery

Generation 5 reveals the two cells that oscillate at the full period (in green).

x = 20, y = 15, rule = B3/S23 7bo4bo$5b2ob4ob2o$7bo4bo2$2o16b2o$bo16bo$bobo12bobo$2b2o12b2o$7bo4bo$ 5b2ob4ob2o$7bo4bo$2b2o12b2o$bobo12bobo$bo16bo$2o16b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 GPS 9 ZOOM 12 LOOP 45 ]] An alternate form of pentadecathlon on snacker, with a slightly smaller bounding box of 20×18 (click above to open LifeViewer) RLE: here Plaintext: here

See also

• Mold on pentadecathlon
• Pentadecathlon on 37P7.1

External links

• Pentadecathlon on snacker at Adam P. Goucher's Catagolue