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A082909
a(n) = Sum_{d|n} (d mod 3).
2
1, 3, 1, 4, 3, 3, 2, 6, 1, 6, 3, 4, 2, 6, 3, 7, 3, 3, 2, 9, 2, 6, 3, 6, 4, 6, 1, 8, 3, 6, 2, 9, 3, 6, 6, 4, 2, 6, 2, 12, 3, 6, 2, 9, 3, 6, 3, 7, 3, 9, 3, 8, 3, 3, 6, 12, 2, 6, 3, 9, 2, 6, 2, 10, 6, 6, 2, 9, 3, 12, 3, 6, 2, 6, 4, 8, 6, 6, 2, 15, 1, 6, 3, 8, 6, 6, 3, 12, 3, 6, 4, 9, 2, 6, 6, 9, 2, 9, 3, 13, 3, 6
OFFSET
1,2
COMMENTS
The old entry with this sequence number was a duplicate of A070940.
MATHEMATICA
Table[Total[Mod[Divisors[n], 3]], {n, 110}] (* Harvey P. Dale, Jan 01 2019 *)
Table[DivisorSum[n, Mod[#, 3]&], {n, 110}] (* Harvey P. Dale, Jan 09 2022 *)
CROSSREFS
Sequence in context: A307280 A209704 A339106 * A335906 A029151 A102595
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Nov 02 2008
STATUS
approved