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This sequence is a re-ordering (with duplication) of A006512.
Table of n, a(n) for n=1..81.
Cf. A006512, A002808, A119689.
Sequence in context: A122271 A011205 A167133 * A215732 A010718 A247872
Adjacent sequences: A144564 A144565 A144566 * A144568 A144569 A144570
Juri-Stepan Gerasimov, Jan 04 2009
Comment, correction, and extension by Charles R Greathouse IV, Mar 29 2010