Raucci's p217

Raucci's p217
x = 74, y = 74, rule = B3/S23 38b2obo2bob2o$31b2o4bo2bo4bo2bo4b2o$31b2o5bobo4bobo5b2o$39bo6bo6$39bo 6bo$31b2o5bobo4bobo5b2o$31b2o4bo2bo4bo2bo4b2o$38b2obo2bob2o7$b2o7b2o$b 2o7b2o4$27b2o$bo9bo14bo2bo$obo7bobo14bo2bo17bo$o2bo5bo2bo14bo2bo15b2ob o$b2o7b2o16b3o14bo3bo$o11bo32bo2bo$45b3o$62b2o7b2o$o11bo49b2o7b2o$b2o 7b2o$o2bo5bo2bo$obo7bobo$bo9bo$62bo9bo$61bobo7bobo$61bo2bo5bo2bo$62b2o 7b2o$b2o7b2o49bo11bo$b2o7b2o$26b3o$25bo2bo32bo11bo$24bo3bo14b3o16b2o7b 2o$24bob2o15bo2bo14bo2bo5bo2bo$25bo17bo2bo14bobo7bobo$44bo2bo14bo9bo$ 45b2o4$62b2o7b2o$62b2o7b2o7$26b2obo2bob2o$19b2o4bo2bo4bo2bo4b2o$19b2o 5bobo4bobo5b2o$27bo6bo6$27bo6bo$19b2o5bobo4bobo5b2o$19b2o4bo2bo4bo2bo 4b2o$26b2obo2bob2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ ZOOM 4 HEIGHT 400 GPS 16 ]]
View static image
Pattern type	Oscillator
Number of cells	236
Bounding box	74 × 74
Period	217
Mod	217
Heat	345.7
Volatility	0.99
Strict volatility	0.45
Discovered by	David Raucci
Year of discovery	2021
Rules Outer-totalistic rules B3/S23 only # of rules 20 = 1 Isotropic rules B3/S23 only
Glider synthesis Fewest gliders 122† Catagolue-generated RLE synthesis †Can be constructed with 15 gliders using the reverse caber tosser universal constructor.
Pattern files RLE rauccisp217.rle
Identifiers apgcode xp217_ygccy068cd1w1dc86y0cczzyg66y0c26mgwgm62cy066zzyzyk33y333zyl8oo0gya8sm7y9g2qsy3sq2gzwccy3ccya131yrp0ggy3gg0pz088gy3g88yzy5453y3354z6033y33306ysgybccy3ccz3gmey3emg3y9oqe4ya31764zwggy3ggyb1zw11y311zysooy0cgoq2w2qogcy0oozzysccy0o4ccy0cc4oy0cczyzw11w11

Raucci's p217 is a period-217 oscillator found by David Raucci on May 5, 2021. It consists of four U-turners (which had no name at the time) being hassled by four Merzenich's p31s.

The bounding box can be reduced from 74 × 74 to 72 × 72 by using the duoplet sparks of Merzenich's p31 instead of the domino sparks, but this increases its minimum population by 20 cells due to a change in phase, as shown below.

x = 72, y = 72, rule = B3/S23 29b3o4b3o$22b2o4bo2b2o2b2o2bo4b2o$22b2o5bobo4bobo5b2o$30bo6bo6$30bo6bo $22b2o5bobo4bobo5b2o$22b2o4bo2b2o2b2o2bo4b2o$29b3o4b3o10$60b2o7b2o$60b 2o7b2o2$30b2o$b2o7b2o15b5o9b3o$b2o7b2o15b5o8bo3b2o$26bob4o8bo2b3o14bo 9bo$26bo3b2o8b2ob3o13bobo7bobo$26bo2bo12b5o12bo2bo5bo2bo$27b3o12b5o12b 3o7b3o$bo9bo48bo9bo$obo7bobo$o2bo5bo2bo$3o7b3o47bo9bo$bo9bo47b3o7b3o$ 59bo2bo5bo2bo$59bobo7bobo$bo9bo48bo9bo$3o7b3o12b5o12b3o$o2bo5bo2bo12b 5o12bo2bo$obo7bobo13b3ob2o8b2o3bo$bo9bo14b3o2bo8b4obo$26b2o3bo8b5o15b 2o7b2o$28b3o9b5o15b2o7b2o$40b2o2$b2o7b2o$b2o7b2o10$33b3o4b3o$26b2o4bo 2b2o2b2o2bo4b2o$26b2o5bobo4bobo5b2o$34bo6bo6$34bo6bo$26b2o5bobo4bobo5b 2o$26b2o4bo2b2o2b2o2bo4b2o$33b3o4b3o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 ZOOM 8 GPS 16 HEIGHT 660 WIDTH 680 AUTOSTART ]]

72 × 72 variant with minimum population 256 (click above to open LifeViewer) RLE: here Plaintext: here

Dave Greene found a 160-glider synthesis for this oscillator on January 15, 2022. On December 24, 2023, Chris857 lowered the synthesis cost to 122 gliders.

Charity's p25 also hassles 8 U-turners, as well as 8 lumps of muck.

See also

• U-turner hasslers, lists other known U-turner hasslers

External links

• Raucci's p217 at Adam P. Goucher's Catagolue