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x = 28, y = 39, rule = B3/S23 19bo$18bobo$19bo2$17b5o$4b2o6b2o3bo4bo$4bo7bo7bo2bo$5b3ob2obo7b2obo2bo $2o5bobobo5bo5bobobo$bo8bo5bobo4bo2bo$bobo12bo2bo2b2o$2b2o13b2o3$9bobo $9bobo$9b3o6$16b3o$16bobo$16bobo3$9b2o13b2o$4b2o2bo2bo12bobo$bo2bo4bob o5bo8bo$obobo5bo5bobobo5b2o$bo2bob2o7bob2ob3o$4bo2bo7bo7bo$5bo4bo3b2o 6b2o$6b5o2$8bo$7bobo$8bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ LOOP 34 GPS 17 THUMBSIZE 2 HEIGHT 600 WIDTH 600 ]]
Pattern type Oscillator
Number of cells 120
Bounding box 28 × 39
Period 34
Mod 34
Heat 30.9
Volatility 0.79
Strict volatility 0.79
Discovered by Mitchell Riley
Year of discovery 2022

120P34 is a period-34 oscillator discovered by Mitchell Riley on September 13, 2022 using CatForce,[1] and is the second non-trivial example of its period. It uses a pair of gourmet catalysts, Eater 3s, and fishhooks to hassle two Pi-heptominoes.

34 was the third to last oscillator period to be found, but the first non-trivial p34 oscillator, 74P34, was found only slightly more than two months earlier on July 6 of the same year. Both p34 oscillators have multiple similarities: they are both pi-heptomino hasslers with 180° symmetry found using symmetric CatForce.

Chris857 found an 89-glider synthesis of this oscillator using a cheaper eater 3 variant on September 29, 2022,[2] which was later reduced to 71 gliders. On February 13, 2024, KtT lowered the cost of this synthesis to 70 gliders and completed a 95-glider synthesis of the canonical form.[3][4]

See also

  • PT8P, used in this oscillator


  1. Mitchell Riley (September 13, 2022). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
  2. Chris857 (September 29, 2022). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  3. KtT (February 13, 2024). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  4. shinjuku (#6164077608) (February 13, 2024). Job triggered by Adam P. Goucher at GitLab Catagolue project.

External links