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A108964
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Write n in balanced ternary notation, omit any zeros and form the left-to-right alternating sum mod 3.
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0
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0, 1, 2, 1, 0, 1, 2, 0, 2, 1, 0, 2, 0, 1, 2, 1, 0, 1, 2, 0, 1, 0, 2, 1, 2, 0, 2, 1, 0
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| This sequence and A036581 are squarefree (they do not contain any substring XX).
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EXAMPLE
| 1="1", so a(1)=1; 2=3-1="1,-1", so a(2)=2; 3=3="1,0", so a(3)=1; 4=3+1="1,1", so a(4)=0; ...
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CROSSREFS
| Cf. A036581.
Sequence in context: A141581 A179286 A193690 * A036581 A135055 A035148
Adjacent sequences: A108961 A108962 A108963 * A108965 A108966 A108967
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KEYWORD
| nonn,more
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AUTHOR
| R. William Gosper (rwg(AT)osots.com), Jul 22 2005
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