124P21

124P21 is an unnamed period-21 oscillator that was discovered by Robert Wainwright on February 21, 1995.[1] It was the first non-boring period 21 oscillator to be found.

124P21
<html><div class="rle"><div class="codebox"><div style="display:none;"><code></html> #O Robert Wainwright, February 21, 1995 #C The first period 21 oscillator to be found. x = 36, y = 25, rule = B3/S23 11b2o9bo13b$12bo9bo13b$11bo10bo13b$11b4o6b2o13b$9b2o4bo3bo16b$5b2obobo b3o3bo4bo12b$5b2obo3bo5bo17b$8b2o10b3o13b$5b3o28b$4bo2bo23bo4b$4b2o14b o9bobo3b$ob2o10b3o2bobo8bobo3b$2obob2o22b2obob2o$3bobo8bobo2b3o10b2obo $3bobo9bo14b2o4b$4bo23bo2bo4b$28b3o5b$13b3o10b2o8b$17bo5bo3bob2o5b$12b o4bo3b3obobob2o5b$16bo3bo4b2o9b$13b2o6b4o11b$13bo10bo11b$13bo9bo12b$ 13bo9b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] <nowiki>#C [[ GPS 10.5 THUMBSIZE 2 ZOOM 10 ]]</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
Number of cells 124
Bounding box 36×25
Period 21
Mod 21
Heat 55.8
Volatility 0.64
Strict volatility 0.30
Discovered by Robert Wainwright
Year of discovery 1995

It works by using two period 3 caterers and two copies of 44P7.2 to hassle two traffic light predecessors.

References
  1. Dean Hickerson's oscillator stamp collection. Retrieved on April 17, 2009.
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