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%I #8 Aug 22 2021 20:51:03
%S 21,52,70,101,119,147,168,199,217,248,266,297,315,346,364,395,413,444,
%T 462,490,511,542,560,591,609,640,658,689,707,738,756,787,805,833,854,
%U 885,903,934,952,983,1001,1029,1081,1099,1130
%N Numbers k such that 0 and 3 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_
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