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Numbers k such that 7 and 8 occur juxtaposed in the base-10 representation of k but not of k-1.
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%I #8 Aug 24 2021 10:14:20

%S 78,87,178,187,278,287,378,387,478,487,578,587,678,687,778,780,870,

%T 887,978,987,1078,1087,1178,1187,1278,1287,1378,1387,1478,1487,1578,

%U 1587,1678,1687,1778,1780,1870,1887,1978,1987,2078

%N Numbers k such that 7 and 8 occur juxtaposed in the base-10 representation of k but not of k-1.

%K nonn,base

%O 1,1

%A _Clark Kimberling_