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#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 ]] #C [[ GPS 10.5 THUMBSIZE 2 ZOOM 10 ]]
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

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

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


  1. A period-21 oscillator, jam on 44P7.2, can be constructed from two sparkers (jam and 44P7.2) both of which were known by 1988. However, this type of oscillator is generally considered "boring", and thus not counted despite technically being non-trivial.


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

External links