a(n) is the cyclic length of the iterative sequence f(k) = prime(f(k-1) mod 2^n) with f(0) = 1.

Terms

a(0) =3a(1) =2a(2) =1a(3) =1a(4) =2a(5) =2a(6) =5a(7) =12a(8) =14a(9) =10a(10) =33a(11) =39a(12) =174a(13) =16a(14) =95a(15) =39a(16) =413a(17) =619a(18) =949a(19) =514a(20) =2221a(21) =3842a(22) =2676a(23) =2356a(24) =5588a(25) =8580a(26) =2437a(27) =7853a(28) =14337a(29) =26004