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Numbers n such that string 7,3 occurs in the base 10 representation of n but not of n+1.
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%I #5 Mar 30 2012 18:56:46

%S 73,173,273,373,473,573,673,739,773,873,973,1073,1173,1273,1373,1473,

%T 1573,1673,1739,1773,1873,1973,2073,2173,2273,2373,2473,2573,2673,

%U 2739,2773,2873,2973,3073,3173,3273,3373,3473,3573

%N Numbers n such that string 7,3 occurs in the base 10 representation of n but not of n+1.

%K nonn,base

%O 1,1

%A _Clark Kimberling_