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%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.