Gabriel's p138

	Gabriel's p138
	<a href="/wiki/File:Gabrielsp138.png" class="image" title="Gabriel's p138 image"><img alt="Gabriel's p138 image" src="/w/images/9/91/Gabrielsp138.png" decoding="async" width="185" height="185" /></a>
	<a href="/wiki/File:Gabrielsp138.png" class="image" title="Gabriel's p138 image"><img alt="Gabriel's p138 image" src="/w/images/9/91/Gabrielsp138.png" decoding="async" width="185" height="185" /></a>
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Pattern type	Oscillator
Number of cells	36
Bounding box	33×33
Period	138
Mod	69
Heat	57.7
Volatility	1.00
Strict volatility	0.87
Discovered by	Gabriel Nivasch
Year of discovery	2002
Rules
Outer-totalistic rules	B3/S23 – B38/S23
Important rules	Conway Life
# of rules	21 = 2
Isotropic rules	B3/S23 – B36n8/S236i7e
Glider synthesis
Fewest gliders	12
Catagolue-generated RLE	gabrielsp138_synth.rle
Uploaded synthesis RLE	gabrielsp138_synth.rle
Pattern files
Plaintext	gabrielsp138.cells
RLE	gabrielsp138.rle
Identifiers
apgcode	xp138_w8gw259r84z79431y1go4iszx42rik8w12
Pentadecathlon ID	36P136.1

Gabriel's p138 is a period-138 oscillator discovered by Gabriel Nivasch on October 13, 2002. In terms of its 36 cells, it is, by far, the smallest known period 138 oscillator.^[1] Within a month of its discovery, Jason Summers found a 12-glider synthesis for this oscillator.^[2]

A variant of Gabriel's p138 with blocks.
View animated image.

The first known semi-natural appearance of this oscillator was in November 2014 in a soup found by Dongook Lee using apgsearch.^[3]

References

36P136.1 at Heinrich Koenig's Game of Life Object Catalogs (note: site incorrectly lists period as 136 instead of 138)