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a(n) = ceiling(4n + log(4n)).
8

%I #17 Sep 08 2022 08:46:02

%S 6,11,15,19,23,28,32,36,40,44,48,52,56,61,65,69,73,77,81,85,89,93,97,

%T 101,105,109,113,117,121,125,129,133,137,141,145,149,153,158,162,166,

%U 170,174,178,182,186,190,194,198,202,206,210,214,218,222,226,230

%N a(n) = ceiling(4n + log(4n)).

%H Vincenzo Librandi, <a href="/A212453/b212453.txt">Table of n, a(n) for n = 1..1000</a>

%t Table[Ceiling[4*n + Log[4*n]], {n, 100}] (* _T. D. Noe_, May 21 2012 *)

%o (Magma) [Ceiling(4*n + Log(4*n)): n in [1..80]]; // _Vincenzo Librandi_, Feb 14 2013

%Y Cf. A000523, A062153, A102572, A212445-A212454.

%K nonn,easy

%O 1,1

%A _Mohammad K. Azarian_, May 17 2012