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Numbers k such that 0 and 4 occur juxtaposed in the base-7 representation of k but not of k+1.
0

%I #7 Aug 25 2021 05:04:13

%S 28,53,77,102,126,151,175,202,224,249,273,298,322,347,377,396,420,445,

%T 469,494,518,545,567,592,616,641,665,690,720,739,763,788,812,837,861,

%U 888,910,935,959,984,1008,1033,1063,1082,1106

%N Numbers k such that 0 and 4 occur juxtaposed in the base-7 representation of k but not of k+1.

%Y Cf. A007093.

%K nonn,base

%O 1,1

%A _Clark Kimberling_