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

Terms

a(0) =3a(1) =5a(2) =7a(3) =11a(4) =13a(5) =17a(6) =19a(7) =37a(8) =41a(9) =67a(10) =73a(11) =97a(12) =131a(13) =137a(14) =193a(15) =257a(16) =521a(17) =577a(18) =641a(19) =769a(20) =1033a(21) =1153a(22) =2053a(23) =2081a(24) =2113a(25) =4099a(26) =4129a(27) =8209a(28) =12289a(29) =16417