50093M is a methuselah with a lifespan of 50093 generations, discovered by Rob Liston on January 9, 2021, using apgsearch.[1] The same day, goldenratio used LogicLifeSearch to find a variant (50095M) of this methuselah lasting two more generations,[2] which is currently the longest-lasting known non-infinitely-growing[note 1] methuselah within a 16×16 square. Tanner Jacobi found another variant which does not fit within 16×16 but has a population of only 59 cells.[6] All of these surpass 49768M which was discovered in April 2020.
↑An infinitely growing soup which "goes boring" after 133100 generations due to a backwards-firing stream of gliders was found by Rob Liston on May 12, 2019;[3] however, this is often not counted as a methuselah.[4] Another soup, based on a crystal reaction, was found by Liston on May 29, 2020 lasting 10,514,926 generations.[5]
References
↑Ian07 (January 9, 2021). Re: Soup search results (discussion thread) at the ConwayLife.com forums
↑goldenratio (January 9, 2021). Message in #cgol on the Conwaylife Lounge Discord server
↑Oscar Cunningham (May 12, 2019). Re: Soup search results (discussion thread) at the ConwayLife.com forums
↑Dave Greene (May 12, 2019). Re: Soup search results (discussion thread) at the ConwayLife.com forums
↑Adam P. Goucher (June 17, 2020). Re: Soup search results (discussion thread) at the ConwayLife.com forums
↑Tanner Jacobi (January 9, 2021). Message in #cgol on the Conwaylife Lounge Discord server