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a(n) = ceiling(10000*log_2(n)).
0

%I #9 Aug 02 2019 20:57:46

%S 0,10000,15850,20000,23220,25850,28074,30000,31700,33220,34595,35850,

%T 37005,38074,39069,40000,40875,41700,42480,43220,43924,44595,45236,

%U 45850,46439,47005,47549,48074

%N a(n) = ceiling(10000*log_2(n)).

%t Ceiling[10000*Log[2,Range[50]]] (* _Harvey P. Dale_, May 07 2013 *)

%K nonn

%O 1,2

%A _N. J. A. Sloane_

%E Corrected by _Harvey P. Dale_, May 07 2013