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Numbers n such that string 4,4 occurs in the base 10 representation of n but not of n-1.
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%I #5 Mar 30 2012 18:56:43

%S 44,144,244,344,440,544,644,744,844,944,1044,1144,1244,1344,1440,1544,

%T 1644,1744,1844,1944,2044,2144,2244,2344,2440,2544,2644,2744,2844,

%U 2944,3044,3144,3244,3344,3440,3544,3644,3744,3844

%N Numbers n such that string 4,4 occurs in the base 10 representation of n but not of n-1.

%K nonn,base

%O 1,1

%A _Clark Kimberling_