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A discrete analog of Li(n): floor ( Sum_{k=2..n} 1/log_2 (k) ).
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%I #5 Jul 10 2015 19:39:50

%S 1,1,2,2,2,3,3,3,4,4,4,5,5,5,5,6,6,6,6,7,7,7,7,7,8,8,8,8,8,9,9,9,9,9,

%T 10,10,10,10,10,11,11,11,11,11,12,12,12,12,12,12,13,13,13,13,13,13,14,

%U 14,14,14,14,14,15,15,15,15,15,15,16,16,16,16,16,16

%N A discrete analog of Li(n): floor ( Sum_{k=2..n} 1/log_2 (k) ).

%K nonn

%O 2,3

%A _N. J. A. Sloane_