A001284 Numbers of form m*k with m+1 <= k <= 2m-1.

6, 12, 15, 20, 24, 28, 30, 35, 40, 42, 45, 48, 54, 56, 60, 63, 66, 70, 72, 77, 80, 84, 88, 90, 91, 96, 99, 104, 108, 110, 112, 117, 120, 126, 130, 132, 135, 140, 143, 144, 150, 153, 154, 156