Smith numbers (A006753) for which the arithmetic derivative (A003415) is also a Smith number.

Terms

a(0) =4a(1) =27a(2) =85a(3) =121a(4) =166a(5) =265a(6) =517a(7) =526a(8) =634a(9) =706a(10) =778a(11) =913a(12) =985a(13) =1633a(14) =1822a(15) =1966a(16) =2173a(17) =2218a(18) =2326a(19) =2434a(20) =2605a(21) =2785a(22) =3505a(23) =3802a(24) =3865a(25) =3973a(26) =4306a(27) =4369a(28) =4765a(29) =4918