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|Number of cells||36|
|Discovered by||Gabriel Nivasch|
|Year of discovery||2002|
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. Within a month of its discovery, Jason Summers found a 12-glider synthesis for this oscillator.
The first known semi-natural appearance of this oscillator was in November 2014 in a soup found by Dongook Lee using apgsearch. About 1 in 2.5 million odd-width 90° symmetric soups (C4_1) form a Gabriel's p138 in the centre.
- Gabriel's p138 at Adam P. Goucher's Catagolue
- All natural stator (and toad) variants of Gabriel's p138 (Catagolue)
- 36P136.1 at Heinrich Koenig's Game of Life Object Catalogs (note: site incorrectly lists period as 136 instead of 138)