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Numbers n such that string 7,8 occurs in the base 10 representation of n but not of n-1.
0

%I #5 Mar 30 2012 18:56:44

%S 78,178,278,378,478,578,678,778,780,878,978,1078,1178,1278,1378,1478,

%T 1578,1678,1778,1780,1878,1978,2078,2178,2278,2378,2478,2578,2678,

%U 2778,2780,2878,2978,3078,3178,3278,3378,3478,3578

%N Numbers n such that string 7,8 occurs in the base 10 representation of n but not of n-1.

%K nonn,base

%O 1,1

%A _Clark Kimberling_