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Numbers k such that 2 and 4 occur juxtaposed in the base-10 representation of k but not of k+1.
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%I #9 Aug 28 2021 03:05:31

%S 24,42,124,142,224,249,324,342,429,442,524,542,624,642,724,742,824,

%T 842,924,942,1024,1042,1124,1142,1224,1249,1324,1342,1429,1442,1524,

%U 1542,1624,1642,1724,1742,1824,1842,1924,1942,2024

%N Numbers k such that 2 and 4 occur juxtaposed in the base-10 representation of k but not of k+1.

%K nonn,base

%O 1,1

%A _Clark Kimberling_