Karel's p15

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Karel's p15
x = 10, y = 11, rule = B3/S23 2bo4bo$2b6o$2bo4bo4$2b6o$bo6bo$o8bo$bo6bo$2b6o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 3 ZOOM 14 LOOP 15 ]]
Pattern type Oscillator
Number of cells 28
Bounding box 16×14
Period 15
Mod 15
Heat 34.9
Volatility 1.00
Strict volatility 1.00
Discovered by Karel Suhajda
Year of discovery 2002

Karel's p15 is a period-15 oscillator discovered by Karel Suhajda on December 11, 2002.[1] It consists of a period 15 rotor supported by the domino spark of a pentadecathlon. A pentadecathlon can support 2 Karel's p15s. It provides accessible sparks that can be used to perturb reactions; the advantage of Karel's p15 over a pentadecathlon is that the pentadecathlon's long end reaches its maximum extent on two separate occasions, while Karel's p15 does only once. The p15 bouncer mechanism is an example. In the same month of its discovery, Mark Niemiec found an 18-glider synthesis of this oscillator.[2]

This oscillator first appeared semi-naturally in March 2015.[3]

A glider stream with period divisible by 5 but not 15 can be filtered with a Karel's p15 to triple the period, as shown in the gallery below.


Period 435 gun shows how this pattern thins out the glider stream and triples the period.

See also


  1. Jason Summers' all-osc pattern collection.
  2. Jason Summers' jslife pattern collection.
  3. Dongook Lee (March 15, 2015). Re: Soup search results (discussion thread) at the ConwayLife.com forums

External links

  • 28P15.3 at Heinrich Koenig's Game of Life Object Catalogs