1,1

The old entry with this sequence number was a duplicate of A090331.

Table of n, a(n) for n=1..73.

a(n) = 6*A082909(n). - Michel Marcus, May 26 2014

Table[6 Sum[Mod[d, 3], {d, Divisors[n]}], {n, 50}] (* Wesley Ivan Hurt, May 28 2014 *)

(PARI) a(n) = 6*sumdiv(n, d, d % 3); \\ Michel Marcus, May 26 2014

Cf. A004016, A082909.

Sequence in context: A209341 A077022 A074923 * A264028 A078741 A248461

Adjacent sequences: A093058 A093059 A093060 * A093062 A093063 A093064

nonn,easy

N. J. A. Sloane, Nov 02 2008

approved