Invitation: celebrating 50 years of OEIS, 250000 sequences, and Sloane's 75th, there will be a conference at DIMACS, Rutgers, Oct 9-10 2014.
%N Numbers n such that 2^n does not contain the digit 9 (probably finite).
%Y Cf. A007377, A034293.
%A _Patrick De Geest_, Nov 15 1998.