%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_