Terms of A000203 that are prime.

Terms

a(0) =3a(1) =7a(2) =13a(3) =31a(4) =31a(5) =127a(6) =307a(7) =1093a(8) =1723a(9) =2801a(10) =3541a(11) =8191a(12) =5113a(13) =8011a(14) =10303a(15) =19531a(16) =17293a(17) =28057a(18) =30941a(19) =30103a(20) =131071a(21) =88741a(22) =86143a(23) =147073a(24) =524287a(25) =292561a(26) =459007a(27) =492103a(28) =797161a(29) =552793