Odd primes which can never divide 2^a+2^b+1.

Terms

a(0) =31a(1) =89a(2) =127a(3) =223a(4) =233a(5) =431a(6) =601a(7) =881a(8) =911a(9) =1103a(10) =1801a(11) =2089a(12) =2351a(13) =3191a(14) =3391a(15) =4513a(16) =5209a(17) =6361a(18) =8191a(19) =9623a(20) =9719a(21) =11447a(22) =11471a(23) =13367a(24) =14951a(25) =15193a(26) =15809a(27) =18041a(28) =18121a(29) =18199