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A367054
Number of iterations until a repeating cycle begins in rule 161 cellular automaton in a cyclic universe of circumference n starting with one cell on.
0
0, 0, 2, 0, 0, 4, 4, 0, 0, 2, 2, 0, 0, 8, 8, 0, 0, 2, 2, 0, 0, 4, 4, 0, 0, 2, 2, 0, 0, 16, 16, 0, 0, 2, 2, 0, 0, 4, 4, 0, 0, 2, 2, 0, 0, 8, 8, 0, 0, 2, 2, 0, 0, 4, 4, 0, 0, 2, 2, 0, 0, 32, 32, 0, 0, 2, 2, 0, 0, 4, 4, 0, 0, 2, 2, 0, 0, 8, 8, 0, 0, 2, 2, 0, 0, 4, 4, 0, 0, 2, 2
OFFSET
1,3
EXAMPLE
For n = 2 we have: 10 -> 01 -> 10; since the cycle started from the 0th iteration, a(2) = 0.
For n = 3 we have: 100 -> 000 -> 111 -> 111; since the cycle started from the 2nd iteration, a(3) = 2.
CROSSREFS
Sequence in context: A226288 A185146 A080964 * A134014 A004531 A072071
KEYWORD
nonn
AUTHOR
Angelo Rosso, Nov 03 2023
STATUS
approved