Least k such that prime(k) >= 2^n.

Terms

a(0) =1a(1) =3a(2) =5a(3) =7a(4) =12a(5) =19a(6) =32a(7) =55a(8) =98a(9) =173a(10) =310a(11) =565a(12) =1029a(13) =1901a(14) =3513a(15) =6543a(16) =12252a(17) =23001a(18) =43391a(19) =82026a(20) =155612a(21) =295948a(22) =564164a(23) =1077872a(24) =2063690a(25) =3957810a(26) =7603554a(27) =14630844a(28) =28192751a(29) =54400029