Numbers k such that phi(k) | sigma_3(k).

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =12a(5) =14a(6) =15a(7) =30a(8) =35a(9) =38a(10) =42a(11) =54a(12) =56a(13) =70a(14) =78a(15) =87a(16) =95a(17) =105a(18) =114a(19) =126a(20) =135a(21) =140a(22) =147a(23) =168a(24) =174a(25) =182a(26) =190a(27) =209a(28) =210a(29) =215