%I

%S 1,2,3,4,5,6,7,8,9,10,11,14,15,16,17,18,19,20,23,24,25,26,27,28,30,31,

%T 45,46,47,57,58,59,71,77,99,108

%N Numbers n such that 2^n does not contain the digit 9 (probably finite).

%Y Cf. A007377, A034293.

%K nonn,base

%O 1,2

%A _Patrick De Geest_, Nov 15 1998.