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

Terms

a(0) =6a(1) =12a(2) =15a(3) =20a(4) =24a(5) =28a(6) =30a(7) =35a(8) =40a(9) =42a(10) =45a(11) =48a(12) =54a(13) =56a(14) =60a(15) =63a(16) =66a(17) =70a(18) =72a(19) =77a(20) =80a(21) =84a(22) =88a(23) =90a(24) =91a(25) =96a(26) =99a(27) =104a(28) =108a(29) =110