Union of A208572 and A208573.

Terms

a(0) =3a(1) =5a(2) =11a(3) =17a(4) =29a(5) =41a(6) =59a(7) =71a(8) =101a(9) =137a(10) =197a(11) =269a(12) =419a(13) =521a(14) =809a(15) =1031a(16) =1607a(17) =2081a(18) =3119a(19) =4127a(20) =6197a(21) =8219a(22) =12377a(23) =16451a(24) =24917a(25) =32801a(26) =49169a(27) =65537a(28) =98321a(29) =131111