Primes of the form 2^a + 3^b.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =11a(5) =13a(6) =17a(7) =19a(8) =29a(9) =31a(10) =41a(11) =43a(12) =59a(13) =67a(14) =73a(15) =83a(16) =89a(17) =97a(18) =113a(19) =131a(20) =137a(21) =251a(22) =257a(23) =283a(24) =307a(25) =337a(26) =499a(27) =521a(28) =593a(29) =733