Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".
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