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Marxen-Buntrock machine (1989, 4098 1's, ~47M steps)

Ciro Santilli (@cirosantilli, 37) ... Decision problem Halting problem Busy beaver Busy beaver function Specific values of the Busy beaver function BB(5)
Updated 2025-07-16  0 By others on same topic  0 Discussions Create my own version
Best busy beaver machine known since 1989 as of 2023, before a full proof of all 5 state machines had been carried out.
Entry on The Busy Beaver Challenge: bbchallenge.org/1RB1LC_1RC1RB_1RD0LE_1LA1LD_1RZ0LA
Paper extracted to HTML by Heiner Marxen: turbotm.de/~heiner/BB/mabu90.html

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  3. Busy beaver function
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