A128012 - OEIS

%I #7 Sep 03 2020 15:49:24

%S 3,3,6,9,12,15,21,24,30,36,42,48,57,63,72,81,90,99,111,120,132,144,

%T 156,168,183,195,210,225,240,255,273,288,306,324,342,360,381,399,420,

%U 441,462,483,507,528,552,576,600,624,651,675,702,729,756,783,813,840,870

%N a(n) = 3*A001399(n).

%Y Cf. A001399.

%K nonn,easy,less

%O 0,1

%A _Thomas Wieder_, Feb 11 2007

%E More terms from _Robert G. Wilson v_, Feb 11 2007

%E Offset corrected by _Alois P. Heinz_, Sep 02 2020