Numbers k such that sigma_0(k) divides phi(k).

Terms

a(0) =1a(1) =3a(2) =5a(3) =7a(4) =8a(5) =9a(6) =10a(7) =11a(8) =13a(9) =15a(10) =17a(11) =18a(12) =19a(13) =21a(14) =23a(15) =24a(16) =26a(17) =28a(18) =29a(19) =30a(20) =31a(21) =33a(22) =34a(23) =35a(24) =37a(25) =39a(26) =40a(27) =41a(28) =43a(29) =45