Achim's p8

	Achim's p8
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Pattern type	Oscillator
Number of cells	18
Bounding box	9×9
Frequency class	42.8
Period	8
Mod	4
Heat	14
Volatility	0.90
Strict volatility	0.70
Discovered by	Achim Flammenkamp
Year of discovery	1994
Rules
Outer-totalistic rules	B3/S23 – B38/S023678
Important rules	Conway Life
# of rules	25 = 32
Isotropic rules	B3-ky/S2-i3-cjy – B2n34ceiktwy5-cy6-ik7c8/S0234-anry5-acnr678
Glider synthesis
Fewest gliders	9
Catagolue-generated RLE	achimsp8_synth.rle
Uploaded synthesis RLE	achimsp8_synth.rle
Pattern files
Plaintext	achimsp8.cells
RLE	achimsp8.rle
Identifiers
apgcode	xp8_25du4szx327ba4
Pentadecathlon ID	18P8.1

Achim's p8 is a period-8 oscillator discovered by Achim Flammenkamp on July 20, 1994.^[1]

In August 2004 Jason Summers and Mark Niemiec found a 13-glider synthesis of this oscillator.^[2] On July 8, 2017, gmc_nxtman reduced the cost to 9 gliders.^[3]

Commonness

On Catagolue, it is the fifth most common period 8 oscillator, being slightly less common than smiley but more common than blocker on cis-dock.^[4] It first occurred naturally on August 21, 2015, in a soup submitted to Catagolue by Tanner Jacobi.^[5]

↑ Dean Hickerson's oscillator stamp collection.
↑ Jason Summers' jslife pattern collection.
↑ gmc_nxtman (July 8, 2017). Re: Thread for your unsure discoveries (discussion thread) at the ConwayLife.com forums
↑ Adam P. Goucher. "Statistics". Catagolue. Retrieved on October 27, 2018.
↑ gameoflifeboy (August 21, 2015). Re: Soup search results (discussion thread) at the ConwayLife.com forums