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x = 16, y = 16, rule = B3/S23 obo6b5obo$2b3obobob2o2bo$b2o2bobo2b2o3bo$2bobo2b2obo2b2o$o2bo4b3o3bo$ 3bob3obo$6obobob2obo$6b2ob2ob2o$2b3ob8o$3b2ob4o4b2o$6obo2bo2bo$bo3b3ob 3o2b2o$5obo3bob2obo$2o6bo2bo$2ob3o2bob6o$2b2obobob2o2b2o! #C [[ THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ ZOOM 16 THUMBSIZE 2 WIDTH 480 HEIGHT 480 ]]
Pattern type Methuselah
Number of cells 129
Bounding box 16×16
MCPS 131
Lifespan 42883 generations
Final population 4333
L/I 332.4
F/I 33.6
F/L 0.101
L/MCPS 327.4
Discovered by Adam P. Goucher
Year of discovery 2018

42883M is a methuselah with a lifespan of 42883 generations, discovered by Adam P. Goucher on November 30, 2018, using apgsearch.[1] It is currently the longest-lasting known methuselah to fit within a 16×16 bounding box, surpassing 42100M which was discovered by Dave Greene a month earlier.

Stable pattern

The stable pattern that results from 42883M (excluding 52 escaping gliders) has 4073 cells and consists of 330 blinkers (including 27 traffic lights), 318 blocks, 171 beehives (including ten honey farms), 45 loaves, 49 boats, 13 ships, eight tubs, eight ponds, three long boats, two ship-ties in the form of a fleet, and one toad.

See also


  1. Adam P. Goucher. Re: Soup search results (discussion thread) at the ConwayLife.com forums