%I A044431
%S A044431 99,199,299,399,499,599,699,799,899,990,1099,1199,1299,1399,1499,
%T A044431 1599,1699,1799,1899,1990,2099,2199,2299,2399,2499,2599,2699,
%U A044431 2799,2899,2990,3099,3199,3299,3399,3499,3599,3699,3799,3899
%N A044431 Numbers n such that string 9,9 occurs in the base 10 representation of 
               n but not of n-1.
%Y A044431 Sequence in context: A033674 A043526 A031500 this_sequence A044812 A125820 
               A008902
%Y A044431 Adjacent sequences: A044428 A044429 A044430 this_sequence A044432 A044433 
               A044434
%K A044431 nonn,base
%O A044431 1,1
%A A044431 Clark Kimberling (ck6(AT)evansville.edu)