Base-2 logarithm of A136007(n)+1.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =13a(5) =17a(6) =19a(7) =31a(8) =61a(9) =127a(10) =521a(11) =2281a(12) =3217a(13) =4253a(14) =9941a(15) =19937a(16) =21701a(17) =23209a(18) =44497a(19) =110503a(20) =216091a(21) =859433a(22) =1257787a(23) =3021377a(24) =6972593a(25) =13466917a(26) =20996011a(27) =30402457a(28) =32582657a(29) =42643801