Primes of the form (2^n - 1)*(2^(m+2)) + 3 where n >= 1, m >= 1.

Terms

a(0) =11a(1) =19a(2) =59a(3) =67a(4) =131a(5) =227a(6) =251a(7) =499a(8) =1019a(9) =1987a(10) =4091a(11) =4099a(12) =8179a(13) =32707a(14) =32771a(15) =57347a(16) =65027a(17) =65539a(18) =114691a(19) =130051a(20) =131011a(21) =131059a(22) =262139a(23) =262147a(24) =507907a(25) =1040387a(26) =1048571a(27) =2097091a(28) =4161539a(29) =8372227