Numbers k such that 2^k does not contain the digit 1 (probably finite).

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =6a(5) =8a(6) =11a(7) =12a(8) =15a(9) =16a(10) =19a(11) =23a(12) =25a(13) =28a(14) =32a(15) =33a(16) =35a(17) =38a(18) =43a(19) =52a(20) =56a(21) =59a(22) =63a(23) =66a(24) =73a(25) =91