View source for 0RB1LB 1LA1RB

{{machine|0RB1LB_1LA1RB}}
{{TM|0RB1LB_1LA1RB}} is the [[Beeping Booping Busy Beaver]] champion for BBBB(2), pseudoquasihalting after 18 steps. It was discovered and reported by Charlie Reams in October 2026, correcting an [[wikipedia:Off-by-one error|off-by-1 error]] in previous work.<ref>[https://discord.com/channels/960643023006490684/1243312334907375676/1565879387927224474 Discord message]</ref> This is proven to be the champion for this state and symbol count.<ref>https://github.com/calr3/bbbb</ref>

With boop transition A1 and beep transition A0, the machine boops at steps 6, 13, 18, ...; the first interval contains a single beep (therefore emitting a 1), and all later intervals contain no beeps (therefore emitting 0 infinitely thereafter). So, in the BBBB interpretation, it outputs an infinite stream of zeroes beyond this point and the first zero is emitted at transition 18, so BBBB(M) = 18.

== References ==