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, 160, 165, 168, 170, 176, 180, 182, 187, 190, 192, 195, 198, 204, 208, 209, 210, 216, 220, 221, 224, 228, 231

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn
• easy

Links

• Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

Crossrefs

Subsequence of A005279.

Programs

PARI

list(lim)=my(v=List()); for(m=2,sqrt(lim), for(k=m+1,min(lim\m,2*m-1), listput(v,m*k))); Set(v) \\ Charles R Greathouse IV, Oct 23 2015

Extensions

Terms a(45) and beyond, and offset corrected by Charles R Greathouse IV, Oct 23 2015