Numbers k such that phi(k) | sigma_18(k).

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =22a(5) =33a(6) =66a(7) =262a(8) =750a(9) =786a(10) =2182a(11) =6546a(12) =8646a(13) =56946a(14) =72006a(15) =162066a(16) =222386a(17) =626406a(18) =667158a(19) =737286a(20) =857526a(21) =1223123a(22) =1489686a(23) =1782726a(24) =2446246a(25) =2939046a(26) =3669369a(27) =4388406a(28) =4780947a(29) =6804006