Smallest twin prime > 3*2^n.

Terms

a(0) =11a(1) =17a(2) =29a(3) =59a(4) =101a(5) =197a(6) =419a(7) =809a(8) =1607a(9) =3119a(10) =6197a(11) =12377a(12) =24917a(13) =49169a(14) =98321a(15) =196661a(16) =393299a(17) =786551a(18) =1572869a(19) =3145739a(20) =6292007a(21) =12582917a(22) =25166129a(23) =50331707a(24) =100663427a(25) =201327011a(26) =402653411a(27) =805306457a(28) =1610613929a(29) =3221225549