Numbers in both A002731(n) and A002731(A002731(n)).

Terms

a(0) =3a(1) =11a(2) =19a(3) =59a(4) =69a(5) =221a(6) =271a(7) =349a(8) =371a(9) =391a(10) =441a(11) =451a(12) =521a(13) =529a(14) =649a(15) =779a(16) =869a(17) =921a(18) =929a(19) =951a(20) =1001a(21) =1031a(22) =1051a(23) =1171a(24) =1359a(25) =1391a(26) =1421a(27) =1689a(28) =1701a(29) =2199