204P41

204P41
x = 73, y = 61, rule = B3/S23 34bo$32b3o$31bo$16b2o13b2o$17bo$17bobo$18b2o$28bo$27bo$29bo$27b3o4$40b o$5b2o24b2o5bobo$6bo24bo7b2o$4bo13b2o12b3o$2b4o15b2o11bo$bo14b2obo$o2b 3o10b2o3bob2o$b2o2bo10b2obo3b2o$3b2o16bob2o$3bo14b2o$4bo6b3o7b2o26bo$b 3o7bo38b2o$bo5b2o3bo11bo24b2o$8bo14bobo$5b3o15b2o$5bo2$67bo$48b2o15b3o $47bobo14bo$22b2o24bo11bo3b2o5bo$21b2o38bo7b3o$23bo26b2o7b3o6bo$53b2o 14bo$48b2obo16b2o$48b2o3bob2o10bo2b2o$48b2obo3b2o10b3o2bo$53bob2o14bo$ 38bo11b2o15b4o$38b3o12b2o13bo$32b2o7bo24bo$32bobo5b2o24b2o$32bo4$43b3o $43bo$45bo$44bo$53b2o$53bobo$55bo$40b2o13b2o$41bo$38b3o$38bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ WIDTH 650 HEIGHT 520 THUMBSIZE 2 ZOOM 8 GPS 12 ]]
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Pattern type	Oscillator
Number of cells	204
Bounding box	73 × 61
Period	41 (mod: 41)
Heat	115.1
Volatility	0.90 | 0.90
Kinetic symmetry	.c
Discovered by	Nora Brown
Year of discovery	2023
Rules Outer-totalistic rules B3/S23 – B38/S238 # of rules 22 = 4 Isotropic rules B3/S23 – B38/S234c8
Glider synthesis Fewest gliders (canonical) 118† Catagolue-generated RLE (canonical) synthesis Fewest gliders (cheapest variant) 100† Catagolue-generated RLE (cheapest variant) synthesis †Can be constructed with 15 gliders using the reverse caber tosser universal constructor.
Pattern files Plaintext 204p41.cells RLE 204p41.rle
Identifiers apgcode (canonical) xp41_yu2eg8o6p2sgzyr178cy01101023zyu42ezyxo0m6m0oy6ok46zyk86cy1o8g060qoq06zyt1ycsg48zya4kcylgs26y762sgz8oybo8ylg8z0123xg08oy0321ym111zy4101y5ooox8koy1g0gzy18oy6o38282o3y513zx311y9333wgzyk32hgzyb628s0s4og8g1074zye1243x32 apgcode (cheapest variant) xp41_yf3pajk4ozyb32130321010oge2zyj8ckzxc88gy78s2s8zy111y73mq2rmxggy1s48zy4g8ggy4121x121z0o4cy111y0c4oymocgz11yb11yjggybggzya163ym346y0ggy1643zysg8gxg8gy41121zyk247y111xdr8bdoy7ggzyy27872y71226zyv562zyr8e130g0g8o0og8ozyv345pajo

204P41 is a period-41 oscillator found by Nora Brown on July 21, 2023, and is the first period-41 oscillator to be discovered. Its discovery proved that Conway's Game of Life is omniperiodic.

It was originally found as 208P41, and the blinker eaters were quickly reduced by two cells each. It was the smallest known period-41 oscillator until the discovery of p41 pi-heptomino hassler.

Four copies of the dependent reflector loop can be used to stabilise the vex.

Chris857 and Evin found a 106-glider synthesis of 208P41 the day of its discovery. The synthesis was reduced to 104 gliders several hours later. On September 21, 2024, the cost was lowered to 100 gliders.

On June 24, 2026, Chris857 found a 118-glider synthesis of 204P41.

External links

• 204P41 at Adam P. Goucher's Catagolue