Balanced numbers: numbers k such that phi(k) (A000010) divides sigma(k) (A000203).

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =12a(5) =14a(6) =15a(7) =30a(8) =35a(9) =42a(10) =56a(11) =70a(12) =78a(13) =105a(14) =140a(15) =168a(16) =190a(17) =210a(18) =248a(19) =264a(20) =270a(21) =357a(22) =418a(23) =420a(24) =570a(25) =594a(26) =616a(27) =630a(28) =714a(29) =744