p140 two-glider octomino hassler

p140 two-glider octomino hassler
x = 42, y = 34, rule = B3/S23 19bo$19b3o$22bo$21b2o$2bo7b2o$2b3o5b2o$5bo$4b2o2$40bo$39bobo$40bo$22b3o$22bo2bo2$24b2o3$16b2o2$16bo2bo$17b3o$bo$obo$bo2$36b2o$36bo$30b2o5b3o$30b2o7bo$19b2o$19bo$20b3o$22bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ HEIGHT 500 WIDTH 600 THUMBSIZE 2 ZOOM 10 GPS 56 ]]
View static image
Pattern type	Oscillator
Number of cells	58
Bounding box	42 × 34
Period	140 (mod: 140)
Heat	60.3
Volatility	0.96 | 0.96
Kinetic symmetry	.k
Discovered by	Carson Cheng iNoMed Mitchell Riley
Year of discovery	2023
Rules Outer-totalistic rules B3/S23 only # of rules 20 = 1 Isotropic rules B3/S23 only
Glider synthesis Fewest gliders (canonical) 24† Catagolue-generated RLE (canonical) synthesis Fewest gliders (cheapest variant) 22† Catagolue-generated RLE (cheapest variant) synthesis †Can be constructed with 15 gliders using the reverse caber tosser universal constructor.
Pattern files Plaintext p140twoglideroctominohassler.cells RLE p140twoglideroctominohassler.rle
Identifiers apgcode (canonical) xp140_xgy2ggy332aczx1156x11yogzyic6sgy9121zycggz8k8ya363zyqoox6a8ozyf354c apgcode (cheapest variant) xp140_y2gy2ggy332aczy21156x11zylc6sgyb354czyfggz32acyc363zytoox6a8ozyi354c

The p140 two-glider octomino hassler is an oscillator found by Carson Cheng and iNoMed on August 27, 2023 based on a partial result from Mitchell Riley, and reduced by iNoMed 5 days later. At 58 cells, it is the smallest known period-140 oscillator.

It is not the only oscillator that hassles two-glider octominoes at period 140; the other known one can be seen on another page and is also an R-pentomino hassler.

On August 29, 2023, Chris857 found a 24-glider synthesis of the original eater-stabilised form. He then found a 26-glider synthesis of the smaller tub-stabilised form on September 2, 2023. Chris857 lowered the synthesis cost of each form by 2 gliders on September 21, 2023.

See also

• Two-glider octomino hasslers