Cribbage

Riley's p19
Riley's p19 image
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Pattern type	Oscillator
Number of cells	94
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 the first period-19 oscillator to be found, and was discovered by Mitchell Riley on July 14, 2023, assumedly using CatForce (similarly to the oscillators discovered in the mvr_catforce_stdin census).

On the day of its discovery, iNoMed reduced its minimum population from 100 to 96, then to 94, then May13 reduced it to its current minimal known form of 92. 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, in which it was 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