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%I #7 Apr 13 2021 23:10:54
%S 21,37,41,42,43,45,53,69,73,74,75,77,81,82,83,84,86,87,89,90,91,93,
%T 101,105,106,107,109,117,133,137,138,139,141,145,146,147,148,150,151,
%U 153,154,155,157,161,162,163,164,166,167,168,172
%N a(n) = (1/2)*(n-th number whose base-2 representation has exactly 6 runs).
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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