Numbers n such that phi(sigma(n)) = 5*phi(n).

Terms

a(0) =336a(1) =1008a(2) =1680a(3) =4368a(4) =5040a(5) =12432a(6) =13104a(7) =21840a(8) =24528a(9) =37296a(10) =52752a(11) =57792a(12) =62160a(13) =64848a(14) =65520a(15) =73584a(16) =93072a(17) =105168a(18) =122640a(19) =128520a(20) =133392a(21) =141456a(22) =153552a(23) =158256a(24) =161616a(25) =167700a(26) =173376a(27) =181776a(28) =186480a(29) =194544