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This and A140138 together give all numbers not divisible by 3.
Table of n, a(n) for n=1..65.
Cf. A140080, A140138.
Sequence in context: A161989 A229829 A000069 * A080308 A089559 A165741
Adjacent sequences: A140134 A140135 A140136 * A140138 A140139 A140140
Nadia Heninger and N. J. A. Sloane, Jun 08 2008