A082909 a(n) = Sum_{d|n} (d mod 3).

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.

Links

Table of n, a(n) for n=1..102.

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

Cf. A004016, A093061.

Sequence in context: A307280 A209704 A339106 * A335906 A029151 A102595

Adjacent sequences: A082906 A082907 A082908 * A082910 A082911 A082912

Keyword

nonn

Author

N. J. A. Sloane, Nov 02 2008

Status

approved