a(n) is the smallest prime greater than 2^n such that 2 is a primitive root modulo a(n).

Terms

a(0) =3a(1) =3a(2) =5a(3) =11a(4) =19a(5) =37a(6) =67a(7) =131a(8) =269a(9) =523a(10) =1061a(11) =2053a(12) =4099a(13) =8219a(14) =16421a(15) =32771a(16) =65539a(17) =131213a(18) =262147a(19) =524309a(20) =1048589a(21) =2097211a(22) =4194371a(23) =8388619a(24) =16777259a(25) =33554467a(26) =67108933a(27) =134217773a(28) =268435459a(29) =536871019