Numbers k such that tau(lambda(k)) = lambda(tau(k)).

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =8a(5) =12a(6) =24a(7) =100a(8) =168a(9) =180a(10) =264a(11) =300a(12) =468a(13) =552a(14) =684a(15) =1100a(16) =1128a(17) =1260a(18) =1416a(19) =1848a(20) =1992a(21) =2340a(22) =2568a(23) =3276a(24) =3300a(25) =3600a(26) =3864a(27) =4008a(28) =4296a(29) =4788