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%I
%S 91,191,291,391,491,591,691,791,891,910,991,1091,1191,1291,1391,1491,
%T 1591,1691,1791,1891,1910,1991,2091,2191,2291,2391,2491,2591,2691,
%U 2791,2891,2910,2991,3091,3191,3291,3391,3491,3591
%N Numbers n such that string 9,1 occurs in the base 10 representation of n but not of n-1.
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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