%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_