Numbers k such that sigma(tau(k)) = rad(k).

Terms

a(0) =1a(1) =3a(2) =135a(3) =336a(4) =343a(5) =375a(6) =1134a(7) =14406a(8) =24336a(9) =41067a(10) =54756a(11) =85293a(12) =321408a(13) =428544a(14) =430080a(15) =1028196a(16) =1084752a(17) =1651104a(18) =1886976a(19) =2476656a(20) =2935296a(21) =3066336a(22) =3341637a(23) =3577392a(24) =4599504a(25) =4881384a(26) =5133375a(27) =5366088a(28) =5451264a(29) =8347248