Primes of the form 2^x + 2^y - 1.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =11a(5) =17a(6) =19a(7) =23a(8) =31a(9) =47a(10) =67a(11) =71a(12) =79a(13) =127a(14) =131a(15) =191a(16) =257a(17) =263a(18) =271a(19) =383a(20) =1031a(21) =1039a(22) =1087a(23) =1151a(24) =1279a(25) =2063a(26) =2111a(27) =4099a(28) =4111a(29) =4127