66P106

66P106
x = 35, y = 21, rule = B3/S23 18bo6bo$16b3o4b3o$15bo6bo$15b2o5b2o$3bo28b2o$4b2o28bo$2b2o27bo$4bo27b 2o2$2bo9bo3bo$2bo9bobobobo11b3o$2bo9bo3bo2$bo28bo$2o26bobo$2o27bobo$o 28bo$10b2o5b2o$11bo6bo$8b3o4b3o$8bo6bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ HEIGHT 500 WIDTH 600 THUMBSIZE 2 ZOOM 12 GPS 12 ]]
View static image
Pattern type	Oscillator
Number of cells	66
Bounding box	36 × 21
Period	106 (mod: 53)
Heat	60.7
Volatility	0.89 | 0.78
Kinetic symmetry	n.e
Discovered by	Nora Brown Carson Cheng iNoMed
Year of discovery	2022
Rules Outer-totalistic rules B3/S23 only # of rules 20 = 1 Isotropic rules B3-k/S23 – B34q6c7c/S235k6e
Glider synthesis Fewest gliders 29† Catagolue-generated RLE synthesis †Can be constructed with 15 gliders using the reverse caber tosser universal constructor.
Pattern files Plaintext 66p106.cells RLE 66p106.rle
Identifiers apgcode xp106_y0133204440gcg8z8oy91z0123y14c4z178cy1252y131e8zydc4ozy0gg8y811zy1211w7wc2gc

66P106 is the smallest known period-106 oscillator.

The original form, 115P106, was discovered by Nora Brown on October 1, 2022. In the oscillator, an unnamed reaction is hassled by two traffic stops, two traffic light eaters that are present in AK94, and four eater 1s. With minimum population 115 cells, it became the smallest known period-106 oscillator, beating the record previously held by the 169-cell p106 rectifier loop.

On September 24, 2023, Carson Cheng found a period-2 traffic light catalyst consisting of a toad, a clock, and a transparent blinker, which iNoMed used to reduce the oscillator from 115 cells to 66.

An eight-bit predecessor of the engine is mentioned without a name in Lifeline Volume 8, page 5.

x = 42, y = 29, rule = B3/S23 18b2o$18bo$16bobo$11b2o3b2o$13bo8bo6bo$14bo5b3o4b3o$11bobo5bo6bo$12bo 6b2o5b2o$39b2o$34b2o2bo2bo$34bobo2b2o$37b2o$38bo$2b2ob2o13bobobo13bob 2o$o2bob2o14bo3b2o8b2obo2bo$2obo16bobobo10b2ob2o$3bo$3b2o$b2o2bobo$o2b o2b2o$b2o26b3o$14b2o5b2o$15bo6bo10bo$12b3o4b3o11bo$12bo6bo13bo$24b2o$ 23bobo3b3o$23bo$22b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ HEIGHT 500 WIDTH 600 THUMBSIZE 2 ZOOM 12 GPS 12 ]]

115P106, the original 115-cell form (click above to open LifeViewer) RLE: here Plaintext: here Catagolue: here

Glider synthesis

A 60-glider synthesis for 115P106 was found by Chris857 on the day after its discovery which was then improved to 58 gliders. Chris857 also synthesized a smaller and cheaper variant that has two fumaroles at both ends; they remove blinkers with their domino sparks, but increase the overall period to 106 × 5 = 530.

On September 25, 2023, Chris857 found a 33-glider synthesis of 66P106, which he quickly improved to 32 gliders. KtT lowered the cost of 66P106 to 29 gliders on April 29, 2025.

External links

• 66P106 at Adam P. Goucher's Catagolue
• 115P106 at Adam P. Goucher's Catagolue
• 88P530 at Adam P. Goucher's Catagolue (fumarole-supported version of 115P106)