Elkies' p5

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Elkies' p5
x = 9, y = 8, rule = B3/S23 bo$o2b3o$2bo$3bobo2bo$2b2ob4o$4bo$4bobo$5b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ LOOP 5 GPS 2 THUMBSIZE 2 ]]
Pattern type Oscillator
Number of cells 20
Bounding box 9×8
Frequency class 44.7
Period 5
Mod 5
Heat 6.8
Volatility 0.55
Strict volatility 0.55
Discovered by Noam Elkies
Year of discovery 1997

Elkies' p5 is a period-5 oscillator that was found by Noam Elkies on June 16, 1997.[1]

Elkies' p5 first occurred naturally in a soup found by Dave Greene using Adam P. Goucher's apgsearch program in April 2015.[2] Other efforts from apgsearch allowed a 15-glider synthesis of an 18-cell still life which can be converted to Elkies' p5. This 20-glider synthesis was completed by Brett Berger and Martin Grant.[3] This was further improved to 8 gliders by Brett Berger and Martin Grant[4] following a second natural occurrence in January 2016.[5]

Commonness

On Catagolue, it is the third most common period 5 oscillator if stator variants are excluded, after octagon II and fumarole.[6]

Use as a sparker

Elkies' p5 usually gets destroyed when trying to use it as a sparker, but it works in a few situations. One high-period example is this period-100 wing hassler.[7] Note that two generations after being sparked, there is a two-cell leading edge in the sparker that matches the two cells in the active region.

x = 37, y = 33, rule = B3/S23 12b2o9b2o$12bo11bo$9b2obo11bob2o$9bo2b2obo5bob2o2bo$10b2o3bo5bo3b2o$ 12b2obo5bob2o$6bo5bobo7bobo5bo$5bobo8bo3bo8bobo$5bobo7bo5bo7bobo$ob2ob ob2o19b2obob2obo$2obobo3bo11b3o3bo3bobob2o$5b2ob3o10bo4b3ob2o$4bo2bob 2o8bo3bo2b2obo2bo$4b2o2b3o8b2o5b3o2b2o$9bo4b2o11bo$4b5o5b2o12b5o$3bo 29bo$4b5o12b2o5b5o$9bo11b2o4bo$4b2o2b3o5b2o8b3o2b2o$4bo2bob2o2bo3bo8b 2obo2bo$5b2ob3o4bo10b3ob2o$2obobo3bo3b3o11bo3bobob2o$ob2obob2o19b2obob 2obo$5bobo7bo5bo7bobo$5bobo8bo3bo8bobo$6bo5bobo7bobo5bo$12b2obo5bob2o$ 10b2o3bo5bo3b2o$9bo2b2obo5bob2o2bo$9b2obo11bob2o$12bo11bo$12b2o9b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 8 THUMBSIZE 2 AUTOSTART ZOOM 8 ]]
p100 wing hassler described above
(click above to open LifeViewer)
RLE: here Plaintext: here

See also

References

  1. Jason Summers' jslife pattern collection. Retrieved on October 28, 2020.
  2. Adam P. Goucher (April 9, 2015). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  3. Martin Grant (April 25, 2015). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  4. Brett Berger (January 5, 2016). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  5. gameoflifeboy (January 5, 2016). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  6. Adam P. Goucher. "Statistics". Catagolue. Retrieved on October 27, 2018.
  7. Extrementhusiast (November 10, 2021). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums

External links

  • 20P5.11 at Heinrich Koenig's Game of Life Object Catalogs