Primes of the form 2^j - 2^k + 1, where j > k >= 0.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =13a(5) =17a(6) =29a(7) =31a(8) =61a(9) =97a(10) =113a(11) =127a(12) =193a(13) =241a(14) =257a(15) =449a(16) =509a(17) =769a(18) =1009a(19) =1021a(20) =2017a(21) =4093a(22) =7681a(23) =7937a(24) =8161a(25) =8191a(26) =12289a(27) =15361a(28) =16369a(29) =16381