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A085297 Nonzero residues of Catalan sequence modulo 3; related to the Thue-Morse sequence (A001285). 1
1, 1, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 2, 2, 2, 1, 1, 1, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2, 1, 1, 1, 1, 1, 1, 2, 2, 2, 1, 1, 1, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 2 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
COMMENTS
The runs of zeros in between the digit strings are given in A085296.
LINKS
FORMULA
If a leading '1' is added to the Catalan sequence modulo 3, the only nonzero digit strings are {1, 1, 1, 2, 2, 2} and {2, 2, 2, 1, 1, 1}. Replacing these digit strings with their first digit, {1, 1, 1, 2, 2, 2} -> '1' and {2, 2, 2, 1, 1, 1} -> '2', then omitting all zeros, results in the Thue-Morse sequence.
CROSSREFS
Cf. A001285 (Thue-Morse), A000108 (Catalan), A039969 (d-perfect), A085296.
Sequence in context: A027354 A192227 A102673 * A080972 A037814 A179529
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Jun 24 2003
STATUS
approved

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Last modified July 25 02:35 EDT 2024. Contains 374585 sequences. (Running on oeis4.)