Nondeficient numbers: numbers k such that sigma(k) >= 2k; union of A000396 and A005101.

Terms

a(0) =6a(1) =12a(2) =18a(3) =20a(4) =24a(5) =28a(6) =30a(7) =36a(8) =40a(9) =42a(10) =48a(11) =54a(12) =56a(13) =60a(14) =66a(15) =70a(16) =72a(17) =78a(18) =80a(19) =84a(20) =88a(21) =90a(22) =96a(23) =100a(24) =102a(25) =104a(26) =108a(27) =112a(28) =114a(29) =120