Karel's p177

Karel's p177
x = 46, y = 46, rule = B3/S23 16bo12bo$9b2o24b2o$8b3o3b2o14b2o3b3o$14b2ob2o8b2ob2o$16bo12bo4$2bo40bo $b2o40b2o$b2o40b2o4$2b2o38b2o$2b2o38b2o$o3bo36bo3bo$3bo38bo$3bo38bo9$ 3bo38bo$3bo38bo$o3bo36bo3bo$2b2o38b2o$2b2o38b2o4$b2o40b2o$b2o40b2o$2bo 40bo4$16bo12bo$14b2ob2o8b2ob2o$8b3o3b2o14b2o3b3o$9b2o24b2o$16bo12bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 59 THUMBSIZE 2 HEIGHT 480 WIDTH 480 ]]
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Pattern type	Oscillator
Number of cells	104
Bounding box	62 × 62
Period	177
Mod	177
Heat	215.3
Volatility	1.00
Strict volatility	1.00
Discovered by	Karel Suhajda
Year of discovery	2007
Rules Outer-totalistic rules B3/S23 only # of rules 20 = 1 Isotropic rules B3/S23 – B3/S234c
Glider synthesis Fewest gliders 24† Catagolue-generated RLE synthesis Uploaded synthesis RLE karelsp177_synth.rle †Can be constructed with 15 gliders using the reverse caber tosser universal constructor.
Pattern files Plaintext karelsp177.cells RLE karelsp177.rle
Identifiers apgcode xp177_y3343x6bacy6cab6x343zkk8yy8kkzgo8gywg8ogz0123yw321zzgo4syws4ogzgh1yy1hgz221yy122zy3c2cx6d53y635d6xc2c Pentadecathlon ID 104P177.1

Karel's p177 (or 104P177) is a period-177 oscillator discovered by Karel Suhajda in June 2007. In terms of its minimum population of 104 cells, it is the smallest known period 177 oscillator, tied with caterer on 92P59. It can serve as a 90° or 180° degree reflector in many ways, and with the correct phasing, a glider can pass through it unharmed. On March 21, 2009 Jason Summers found a 24-glider synthesis of this oscillator.

The first known semi-natural appearance of this oscillator was in December 2014, in a symmetric soup found by Dongook Lee using apgsearch. In even-width 8-fold symmetry (D8_4), 1 in 12.3 million soups form Karel's p177.

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Several reactions involving Karel's p177 (click above to open LifeViewer) RLE: here Plaintext: here

See also

• Maximum volatility gun

External links

• Glider Construction of Period 177 Oscillator at Game of Life News. Posted by Heinrich Koenig on May 31, 2009.
• 104P177.1 at Heinrich Koenig's Game of Life Object Catalogs
• Karel's p177 at Adam P. Goucher's Catagolue (as recognized by apgsearch < 4.0)
• Karel's p177 at Adam P. Goucher's Catagolue (extended)