p21 B-heptomino hassler

p21 B-heptomino hassler
#C p21 B-heptomino hassler and pi factory #C found by hotdogPi (David Raucci) on August 1st, 2021 except for #C boat stabilization at bottom, which was found by Kazyan #C (Tanner Jacobi) on August 1st, 2021 x = 38, y = 28, rule = B3/S23 16bo2bo2bo$16b7o2$16b7o$16bo2bo2bo3$26b2o5b2o$26b2o5b2o$19bo$18b3o$17b o2b2o4b3o3b3o$17bo3bo2bo4bobo4bo$19bobo7bobo$23bo3bobobobo3bo$16b2ob2o 3bo2bobobobo2bo$4b2o3b2o7bo6b3obobob3o$2b3obobob3o6bo7b2o3b2o$bo2bobo bobo2bo3b2ob2o$o3bobobobo3bo$6bobo7bobo$bo4bobo4bo2bo3bo$3b3o3b3o4b2o 2bo$17b3o$18bo$3b2o5b2o10bo$3b2o5b2o9bobo$22b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ THUMBSIZE 3 ZOOM 15 HEIGHT 500 WIDTH 700 GPS 7 LOOP 21 ]]
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Pattern type	Oscillator
Number of cells	100
Bounding box	38 × 22
Period	21 (mod: 21)
Heat	69.0
Volatility	0.87 | 0.38
Kinetic symmetry	n
Discovered by	David Raucci
Year of discovery	2021
Rules Outer-totalistic rules B3/S23 – B3/S238 # of rules 21 = 2 Isotropic rules B3aceijknqr/S23aceijknqr – B34c6c7c/S234ce5nr7e8
Glider synthesis Fewest gliders (cheapest variant) 59† Catagolue-generated RLE (cheapest variant) synthesis †Can be constructed with 15 gliders using the reverse caber tosser universal constructor.
Pattern files Plaintext p21bhassler.cells RLE p21bhassler.rle
Identifiers apgcode (canonical) xp21_yaraaraarzwccy1cczx72s0s27y2ocogz1305430345031xgg0gx8c0a2s0s2a0c8zyd131y2e43034ezy9652y533y133 apgcode (cheapest variant) xp21_w66y166y5253zg8nm8s0s8mn8gxckoz010121012101y1elox4akm9u0u9mka4zyagy6jhy1hjzy9321y511y111

The p21 B-heptomino hassler is a pi factory where p7 sparkers cause two B-heptominoes to become two B-heptominoes in the same position and two great-great-great-grandchilds of the house twenty-one generations later, using a mechanism found by David Raucci on August 1st, 2021. The pis must be suppressed or destroyed so that they don't destroy the oscillator. The method that David Raucci originally used is shown at the top of the infobox pattern. The smallest method (both in terms of population and bounding box) is a single boat, which was found by Tanner Jacobi on the same day and is shown at the bottom of the infobox pattern. Fishhooks also work in multiple ways.

Guns

Tanner Jacobi figured out how to turn a pi output from the oscillator into a gun using 28P7.3 on August 1st, making p21 the odd period with the smallest gun and, at the time, the seventh-smallest overall. Adam P. Goucher found ways to overclock a bouncer in order to delete every other glider or two out of every three gliders,, resulting in p42 and p63 guns. Tanner Jacobi then created a p84 gun using that engine by building off of Goucher's p42 gun and trying to overclock a Snark. On May 28, 2022, meatball was discovered by Charity Engine which led to a reduction of the gun's bounding box.

x = 34, y = 27, rule = B3/S23 21b2o$2b2o5b2o9bobo$2b2o5b2o10bo2$3bo5bo$3b2o3b2o8bo$3bobobobo9b2o$5bo bo8b2o6b2o4bo$5bobo10bo5b3ob2obo$2obobobobob2o4bo5bo7bo$bo3bobo3bo4b4o 8b2ob2o$3b2o3b2o6b4o5bo3bo2bo$18bo6bo5bo$17bo6bo2bo3bo$18b2o4b2ob2o$7b 2o6b2o8bo7bo$8bo8bo7bob2ob3o$8bobo15bo4b2o$9b2o$14bo3bo$13bo5b2o$12b2o 4b2o$13b2o$10bo2bo2bo$6b2obobobob2o$6bob2obobo$12b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ MAXGRIDSIZE 9 THUMBSIZE 2 HEIGHT 380 ZOOM 12 GPS 7 THEME Book KILLGLIDERS AUTOSTART ]]

A p21 gun based on the p21 B-heptomino hassler, animated with highlighted envelope (click above to open LifeViewer) RLE: here Plaintext: here

Glider synthesis

On May 24, 2025, Chris857 found 59-glider syntheses of boat-supported and eater-supported versions of the oscillator.

External links

• p21 B-heptomino hassler at Adam P. Goucher's Catagolue