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

Terms

a(0) =1a(1) =2a(2) =4a(3) =9a(4) =16a(5) =18a(6) =64a(7) =100a(8) =225a(9) =242a(10) =450a(11) =516a(12) =729a(13) =1458a(14) =3872a(15) =4096a(16) =4624a(17) =13932a(18) =14406a(19) =17672a(20) =18225a(21) =20124a(22) =21780a(23) =28900a(24) =29262a(25) =29616a(26) =36450a(27) =45996a(28) =62500a(29) =65025