Rob's p16

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Rob's p16
x = 8, y = 9, rule = B3/S23 5b2o$2bo2b2o$bo4bo$bo4bo$6bo$2obobo$2ob2o2$5b3o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 4 LOOP 16 ]]
Pattern type Oscillator
Number of cells 21
Bounding box 10 × 12
Period 16
Mod 8
Heat 21
Volatility 1.00
Strict volatility 1.00
Discovered by Rob Liston
Year of discovery 2020
Not to be confused with Rich's p16.

Rob's p16 is a period-16 oscillator that was found by Rob Liston on February 9, 2020 using Adam P. Goucher's apgsearch,[1] and first noticed by a human the next day.[2] It is the smallest known period-16 oscillator in terms of both population and bounding box, the first p16 to appear naturally, the first known strictly volatile p16, and the first new rotor discovered by asymmetric soup search since the 1980s.

It also gives off weak sparks,[3] which in addition to allowing for the construction of non-trivial higher-period oscillators as seen in a later section, can be used to filter an LWSS stream resulting in a reduction to the pseudo-period p16 glider gun.[4] On November 12, James Pascua constructed a p32 lumps of muck hassler using this oscillator.[5] Later James Pascua constructed a period-48 glider gun that is currently the smallest at that period, also using this oscillator.

Glider synthesis

A 17-glider synthesis of this oscillator was found by Tanner Jacobi the day of its discovery.[6] Liston found a second Rob's p16 soup on June 30,[7] leading to a 15-glider synthesis by Goldtiger997 the next day.[8] Yet another soup found by Liston in February 2021 reduced the cost to 13 gliders and then to 11 gliders.[9][10] A fifth soup by Adam P. Goucher (incidentally the first soup not found by Liston) led to a 10-glider synthesis,[11] which Dave Greene made a slow-salvo seed out of.[12]

Commonness

Main article: List of common oscillators

Information on this oscillator's natural occurrence with respect to other naturally-occurring patterns is currently unknown.

LCM oscillators

The LCM oscillators below are listed due to being the smallest known ones by population, while also satisfying the condition that at least one cell oscillates at the full period.

x = 17, y = 10, rule = B3/S23 2o$o2b2o4b3o$b2obo$5bo6b2ob2o$5bo5bobob2o$b2obo5bo$o2b2o5bo4bo$2o8bo4b o$10b2o2bo$10b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 20 THUMBSIZE 2 ZOOM 16 LOOP 80 ]]
p80 with fumarole (click above to open LifeViewer)
RLE: here Plaintext: here
Catagoluehere
x = 16, y = 10, rule = B3/S23 bo6b3o$bo$obo8b2ob2o$bo8bobob2o$bo7bo$bo7bo4bo$bo7bo4bo$obo6b2o2bo$bo7b2o$bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ GPS 20 THUMBSIZE 2 ZOOM 16 LOOP 80 ]]
p240 with pentadecathlon (click above to open LifeViewer)
RLE: here Plaintext: here
Catagoluehere

References

  1. Adam P. Goucher. "Haul". Catagolue. Retrieved on February 10, 2020.
  2. Tanner Jacobi (February 10, 2020). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
  3. Matthias Merzenich (February 10, 2020). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
  4. Tanner Jacobi (February 11, 2020). Re: Execution of Old Guns by Variable-Speed Firing Squad (discussion thread) at the ConwayLife.com forums
  5. James Pascua (November 12, 2020). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
  6. Tanner Jacobi (February 10, 2020). Re: Oscillator Discussion Thread (discussion thread) at the ConwayLife.com forums
  7. praosylen (June 30, 2020). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  8. Goldtiger997 (July 1, 2020). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  9. goldenratio (February 14, 2021). Message in #cgol on the Conwaylife Lounge Discord server
  10. Goldtiger997 (February 14, 2021). Message in #cgol on the Conwaylife Lounge Discord server
  11. Tanner Jacobi (March 25, 2021). Re: Soup search results (discussion thread) at the ConwayLife.com forums
  12. Dave Greene (March 25, 2021). Re: Soup search results (discussion thread) at the ConwayLife.com forums

External links