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a(n) = ceiling(1000*log_2(n)).
1

%I #17 Oct 30 2024 19:34:09

%S 0,1000,1585,2000,2322,2585,2808,3000,3170,3322,3460,3585,3701,3808,

%T 3907,4000,4088,4170,4248,4322,4393,4460,4524,4585,4644,4701,4755,

%U 4808,4858,4907,4955,5000,5045,5088,5130,5170,5210,5248,5286,5322,5358,5393,5427,5460,5492

%N a(n) = ceiling(1000*log_2(n)).

%H Marius A. Burtea, <a href="/A004267/b004267.txt">Table of n, a(n) for n = 1..1000</a>

%t Ceiling[1000*Log[2,Range[40]]] (* _Harvey P. Dale_, May 04 2013 *)

%o (Magma) [Ceiling(1000*Log(2,n)):n in [1..50]]; // _Marius A. Burtea_, Aug 02 2019

%K nonn

%O 1,2

%A _N. J. A. Sloane_

%E Corrected by _N. J. A. Sloane_, May 04 2013 at the suggestion of _Harvey P. Dale_