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#O Noam Elkies, September 23, 1994 #C The first period 25 oscillator to be found. x = 35, y = 23, rule = B3/S23 21bo13b$19b3o13b$18bo8bo2b2o3b$9b2o7b2o6bobo2bo3b$10bo15bobobo4b$10bob o12b2obob2o3b$11b2o11bo3bo3bo2b$19bo4bo4bobobob$6b2o9b2ob2o2bo3b2o3bob $5bo2bo10bo4bo4bob2o2b$o2bo2bobo15bo3bo6b$5obob2o15b2obob5o$6bo3bo15bo bo2bo2bo$2b2obo4bo4bo10bo2bo5b$bo3b2o3bo2b2ob2o9b2o6b$bobobo4bo4bo19b$ 2bo3bo3bo11b2o11b$3b2obob2o12bobo10b$4bobobo15bo10b$3bo2bobo6b2o7b2o9b $3b2o2bo8bo18b$13b3o19b$13bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 5 LOOP 25 THUMBSIZE 2 ZOOM 10 ]]
Pattern type Oscillator
Number of cells 134
Bounding box 35 × 23
Period 25
Mod 25
Heat 51.2
Volatility 0.64
Strict volatility 0.40
Discovered by Noam Elkies
Year of discovery 1994

134P25 is an unnamed period-25 oscillator. It was the first period 25 oscillator to be found,[1] and was discovered by Noam Elkies on September 23, 1994. In its original form it used toasters instead of eater 1s.

It works by using two middleweight volcanos to push two T-tetrominoes three cells in 14 generations and then back in 11 generations.

A similar reaction is employed in the current smallest period-20 glider gun, albeit where a middleweight volcano hassles a T-tetromino three iterations after its appearance, that becomes a traffic light predecessor in thirteen more, and in the T-nosed p20.


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

External links