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%I #8 Aug 22 2021 22:15:34
%S 20,44,69,93,118,140,167,191,216,240,265,289,308,338,363,387,412,436,
%T 461,483,510,534,559,583,608,632,651,681,706,730,755,779,804,826,853,
%U 877,902,926,951,975,980,1049,1073,1098,1122
%N Numbers k such that 2 and 6 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_