|View static image|
|Number of cells||131|
|Bounding box||16 × 16|
|Discovered by||Adam P. Goucher|
|Year of discovery||2019|
47575M is a methuselah with a lifespan of 47575 generations, discovered by Adam P. Goucher on February 10, 2019, using apgsearch. It was formerly the longest-lasting known non-infinitely-growing[note 1] methuselah to fit within a 16 × 16 bounding box, surpassing Homer which was discovered in November of the previous year. This title was taken by 49768M in April 2020.
On the following day, Goucher found an 18-cell form lasting 47484 generations. A few minutes later, Tanner Jacobi and praosylen responded with 16-cell forms each lasting three more generations. Jacobi's variant, shown below, has a lifespan of 47487 generations, a bounding box of 22 × 17, and an MCPS of 37. This 16-cell methuselah is composed of a pre-block, blinker, T-tetromino, and wing.
|16-cell variant of 47575M with a bounding box of 22 × 17|
(click above to open LifeViewer)
RLE: here Plaintext: here
The stable pattern that results from 47575M (excluding 57 escaping gliders) has 3769 cells and consists of 281 blinkers (including 31 traffic lights), 276 blocks, 157 beehives (including five honey farms), 52 loaves, 52 boats, 16 ships, 11 ponds, eight tubs, four long boats, one carrier, and one toad.
- See Methuselah#Infinite_growth for more details on infinitely growing soups.