Position of 2^n in A070003.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =13a(5) =22a(6) =36a(7) =57a(8) =89a(9) =142a(10) =224a(11) =354a(12) =562a(13) =893a(14) =1425a(15) =2276a(16) =3642a(17) =5838a(18) =9397a(19) =15154a(20) =24517a(21) =39757a(22) =64606a(23) =105249a(24) =171873a(25) =281236a(26) =461254a(27) =758039a(28) =1248269