T-nosed p4

T-nosed p4 is a period-4 oscillator that was found in October 1989 by Robert Wainwright.[1] It can be used as a filter that deletes every other lightweight spaceship in a stream of period 4n + 2.[2] A smaller variant was posted by Tanner Jacobi on December 4, 2017,[3] and a 79-glider synthesis of said variant was found by Jacobi and Mark Niemiec on May 8, 2019.[4]

<html><div class="rle"><div class="codebox"><div style="display:none;"><code></html>x = 17, y = 12, rule = B3/S23 2$7b3o2$6bo3bo$2b2obo5bob2o$2bo11bo$3b2o7b2o$3o2b7o2b3o$o2bo9bo2bo$b2o 5bo5b2o$7b3o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART GPS 2 LOOP 4 THUMBLAUNCH THUMBSIZE 2 THEME 6 ZOOM 16 HEIGHT 320 ]]<html></code></div></div><canvas width="200" height="300" style="margin-left:1px;"><noscript></html>
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Variant based on the overweight emulator
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RLE: here Plaintext: here
<html><div class="rle"><div class="codebox"><div style="display:none;"><code></html>x = 10, y = 12, rule = B3/S23 4b3o2$3bo3bo2$3bo2bo$2bo2b2o$bobobo2bo$bob3o3bo$2bobobobo$3bo$3o$o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART GPS 2 LOOP 4 THUMBLAUNCH THUMBSIZE 2 THEME 6 ZOOM 16 HEIGHT 320 ]]<html></code></div></div><canvas width="200" height="300" style="margin-left:1px;"><noscript></html>
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Smaller 25-cell variant
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RLE: here Plaintext: here
T-nosed p4
<html><div class="rle"><div class="codebox"><div style="display:none;"><code></html>4b3o4b$5bo5b2$4b3o4b$3bo3bo3b$2bo5bo2b$2bobobobo2b$b2obobob2ob$o2b2ob 2o2bo$2o7b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] <nowiki>#C [[ TRACKLOOP 4 0 0 GPS 2 THUMBSIZE 2 ]]</nowiki> <html></code></div></div><canvas width="200" height="300" style="margin-left:1px;"><noscript></html> <html></noscript></canvas></div></html>
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Pattern type Oscillator
Oscillator type T-nose
Number of cells 31
Bounding box 11×12
Period 4
Mod 4
Heat 15
Volatility 0.55
Strict volatility 0.49
Discovered by Robert Wainwright
Year of discovery 1989

See also

References
  1. Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
  2. "Filter". The Life Lexicon. Stephen Silver. Retrieved on March 15, 2009.
  3. Tanner Jacobi (December 4, 2017). Re: Thread for your unsure discoveries (discussion thread) at the ConwayLife.com forums
  4. Mark Niemiec (May 8, 2019). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums
  • 31P4.1 at Heinrich Koenig's Game of Life Object Catalogs
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