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Numbers n such that string 4,0 occurs in the base 10 representation of n but not of n-1.
0

%I #5 Mar 30 2012 18:56:43

%S 40,140,240,340,400,440,540,640,740,840,940,1040,1140,1240,1340,1400,

%T 1440,1540,1640,1740,1840,1940,2040,2140,2240,2340,2400,2440,2540,

%U 2640,2740,2840,2940,3040,3140,3240,3340,3400,3440

%N Numbers n such that string 4,0 occurs in the base 10 representation of n but not of n-1.

%K nonn,base

%O 1,1

%A _Clark Kimberling_