Cribbage

Riley's p19
Riley's p19 image
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Pattern type	Oscillator
Number of cells	92
Bounding box	32 × 21
Period	19 (mod: 19)
Heat	33.5
Volatility	0.72 | 0.72
Kinetic symmetry	Unspecified
Discovered by	Mitchell Riley
Year of discovery	2023
Rules Outer-totalistic rules B3/S23 – B38/S238 # of rules 22 = 4 Isotropic rules B3/S23 – B34ce6cen8/S234cz5ekn6ein8
Pattern files Plaintext rileysp19.cells RLE rileysp19.rle
Identifiers apgcode xp19_08o6he8gy4c88gziu1clld03xoy11108cy2g8gzw343y2c5y47xg0cabc1uizya354cy3125t3o74zyp1

Riley's p19 is a period-19 found by Mitchell Riley on July 14 2023 using CatForce, and is the first period-19 oscillator to be discovered.

On the day of its discovery, iNoMed discovered a pair of successive stator reductions over the original form (first to 96 cells, then to 94), which was subsequently reduced by May13 to a 92-cell form. Each reduction was made by replacing its stators with smaller components.

x = 34, y = 21, rule = B3/S23 29bo$28bobo$17bo10bobo$15b3o9b2o2b2o$14bo11bo2bobo$14b2o9bob3obo$25bo6b2o$11bo15b4obo$3bo7b2o8bo5bo2bobo$2bobo16bo6b2o2b2o$2bobo7bo8bo7bobo$2o2b2o6bo16bobo$bobo2bo5bo8b2o7bo$bob4o15bo$2o6bo$2bob3obo9b2o$2bobo2bo11bo$b2o2b2o9b3o$3bobo10bo$3bobo$4bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ]]

The original form, as initially discovered (click above to open LifeViewer)

x = 38, y = 13, rule = B3/S23 3bo8b2o8b2o8b2o$2bobo7bobo7bobo7bobo$2bobo9bo9bo9bo$2o2b2o8b2o5bo2b2o8b2o$bobo3bo4b2o3bo3b3o3bo4b2o3bo$bob5o3bo2b4o6b4o3bo2b4o$2o10b2o9bo7bobo$2bob4o6b4o4bob4o4bob4o$2bobo2bo6bo2bo4bobo2bo6bo2bo$b2o2b2o8b2o4b2o2b2o5bo2b2o$3bobo4b2obobo7bobo6b2obo$3bobo4bob2o2bo6bobo9bo$4bo10b2o7bo10b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ]]

The stator variants, from the discovery (left), iNoMed's reductions and the current form (right). (click above to open LifeViewer)

External links

• Riley's p19 at Adam P. Goucher's Catagolue