Composite numbers k such that k*phi(k) is in A002378.

Terms

a(0) =6a(1) =30a(2) =434a(3) =510a(4) =616a(5) =912a(6) =1640a(7) =2989a(8) =3003a(9) =5934a(10) =7280a(11) =8600a(12) =10726a(13) =12700a(14) =13825a(15) =14288a(16) =18699a(17) =19389a(18) =54153a(19) =59394a(20) =59906a(21) =70563a(22) =72816a(23) =116052a(24) =117964a(25) =121954a(26) =131070a(27) =134212a(28) =140752a(29) =177000