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A093061
6 * Sum_{d|n} (d mod 3).
2
6, 18, 6, 24, 18, 18, 12, 36, 6, 36, 18, 24, 12, 36, 18, 42, 18, 18, 12, 54, 12, 36, 18, 36, 24, 36, 6, 48, 18, 36, 12, 54, 18, 36, 36, 24, 12, 36, 12, 72, 18, 36, 12, 54, 18, 36, 18, 42, 18, 54, 18, 48, 18, 18, 36, 72, 12, 36, 18, 54, 12, 36, 12, 60, 36, 36, 12, 54, 18, 72, 18, 36, 12
OFFSET
1,1
COMMENTS
The old entry with this sequence number was a duplicate of A090331.
FORMULA
a(n) = 6*A082909(n). - Michel Marcus, May 26 2014
MATHEMATICA
Table[6 Sum[Mod[d, 3], {d, Divisors[n]}], {n, 50}] (* Wesley Ivan Hurt, May 28 2014 *)
PROG
(PARI) a(n) = 6*sumdiv(n, d, d % 3); \\ Michel Marcus, May 26 2014
CROSSREFS
Sequence in context: A355787 A077022 A074923 * A264028 A078741 A248461
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Nov 02 2008
STATUS
approved