Numbers n such that 2^n does not contain the digit 6 (probably finite).

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =5a(5) =7a(6) =9a(7) =10a(8) =11a(9) =13a(10) =17a(11) =19a(12) =21a(13) =22a(14) =25a(15) =27a(16) =30a(17) =33a(18) =37a(19) =39a(20) =41a(21) =45a(22) =47a(23) =53a(24) =54a(25) =57a(26) =90a(27) =93